Best B2B Event Marketing Agency in London

We asked Londoners what they dislike more: soggy scones or poorly executed B2B events. The results were inconclusive, but the take-away was clear, hire a great event marketing agency! 😂

"Best" is always a relative term. What might be ideal for your company and objectives may be completely irrelevant for another.

However, the team here at ConvergeX Connections have a few opinions on best which will be worth your time. Having hosted various events for companies like Meltwater, Workvivo by Zoom, Alteryx, EXL, Wolters Kluwer and many more in London. We know considering to host an event in London is never a question of "if" but "when". 

London is an international business hub where there are easily upwards of about 1.1 million+ Senior managers, Directors, VP's, Heads and CXO's.

For a full break up on industries, company sizes, function, and more, check out our decision makers insight report in London 2026! (Contact us with the query for early access!) 

With all these decision makers, unpredictable weather but charming British humor, its no wonder we constantly see London as the go-to regional gateway to EU and even EMEA as a whole. 

HockeyStack expanding to the EU by opening their office in London isn't also a coincidence. 

So my brag about London is over, let's get back to the real topic at hand, which is: "How do we pick the right event marketing agency in London?"

It all goes down to the following 7 principles we'd transparently ask you to check. 

1. Does this event marketing agency design events around strategic business objectives?

If you're in an exploratory evaluation call and your first point of contact only dictates what they do vs asking what your strategic objective is, that event marketing agency has already lost the plot. 

Yes a seller should have a consultative approach to understand your needs as a buyer. A buyer needs to be crystal clear on strategic alignment and what is actually needed. Some events can be

Webinars
Educational sessions (non sales)
Executive roundtables, dinners, and lunches (to connect with potential enterprise buyers)
Product launches 
Conferences

The objective for each is very different. Questions you should be thinking about: 

1. Is the objective of hosting an event sales or brand awareness, or internal education program
2. Which KPI's are you looking to achieve from such an event? 
3. Which format aligns best for your 

2. Do They Actually Understand London’s B2B Buyer Mix?

London isn’t one market — it’s finance, tech, professional services, SaaS, consulting, media, and global HQs layered on top of each other.
Ask: Which London buyer profiles do you specialise in?
Vague answers = inexperience.

With a varied age buyer group and a popular younger buyer group (millennials / GenZ) driving tech adoption. It's useful to adopt your strategy to the age group or buyer type. 

3. Can They Access Senior Decision-Makers in London Not Just Attendees?

UK has historically had a conservative and risk-averse business culture. This can lead to long sales cycles, profitable if you know what you're doing. Having an event marketing company in London not about arranging "attendees" but actual decision makers is a super power.

Ask how many many events you've held in London and what type of decision makers have you managed to attract. 

For example, ConvergeX Connections have a strong network of decision makers in marketing, operations, finance, customer experience, IT & Cybersecurity in London. With event examples to prove it. This allows us to tap into our vast network of decision makers and have hosted various in-person and virtual formats. 

4. Venue Strategy: Prestige vs Practicality

In London, the venue signals intent. For example if you're hosting a private roundtable dinner and inviting VP's and C-levels you should know which venue fits. 
A great event marketing agency knows when a Mayfair private dining room beats a Shoreditch warehouse, and when it doesn’t.
If they default to “trendy” without rationale, they’re guessing. Impressions are important but going into the nuances on venue strategy is key. The room shouldn't be congested, yet be quiet enough for conversations to get started without interruption.

5. Do They Respect London Buyers’ Time (Ruthlessly)?

Every market needs to be understood. 

London executives won’t tolerate:

• Long intros

• Overcrowded agendas

• Pointless panels

Strong agencies design short, focused formats, breakfast briefings, executive dinners, tight roundtables, not half-day marathons. You want to build meaningful experiences and that means being respectful with the agenda and making it as relevant as possible. 

6. Experience Navigating London Logistics (Quietly and Smoothly)

Transport strikes, last-minute delays, security requirements, accessibility , you need an agency that solves these before you ever hear about them. It's also crucial to understand the b2b conference season during summer and autumn. This will help you choose the right date for your event as well.

Londoner's also get flooded with event invites, you're not the only one keen to invite a decision maker. You need to differentiate yourself, not sound salesy and make it worth their time. 

Ask an agency how they do outreach to invite executives for your event. What is your drop-off rate (ConvergeX currently sits at a less than 15% drop-off rate). 

7. GDPR & Data Handling Confidence

Just because UK left the EU doesn't mean GDPR is irrelevant. On the contrary you can bet that not having an event marketing agency with serious experience might be a major disadvantage. All ConvergeX Connections events have policies and formats in place for EU based GDPR compliance. We don't just source attendees we ensure compliance. 

In London and the UK, GDPR compliance isn’t optional.
Ask how attendee data is handled, shared, stored, and passed to sales, especially post-event.

8. Do They Specialise in B2B (Not Consumer or Mixed Events)?

Many dedicated B2B event marketing companies will feel this one. Just because you've hosted successful B2C events doesn't mean B2B is a walk in the park. On the contrary, depending on the type of events they can be very difficult to fill. Don't make the mistake of hiring a successful B2C & B2B event marketing company. As tempting as it can be, the skill set is very unique. 

9. What Is Their Post-Event Follow-Up Strategy?

We hear this a lot from field marketing and event organizers that, once the event settles, the service is over. According to ConvergeX Connections team, that is a massive red-flag when hiring a B2B event marketing company anywhere not just in London. We set the standard by guaranteeing our clients at least 50% of the attendees will book post-event follow-up meetings. We're currently averaging about 70% of post-event meetings booked. That means for a 14 person executive dinner you can expect us to product 7-9 booked meetings with decision makers. 

10. Understanding of UK Buying Culture (Subtle but Critical)

British buyers dislike:

• Hard selling

• Overhyped claims

• American-style bravado

The right agency understands the more understated, credibility-driven UK approach. We often discourage imposing product overviews at the start of any event we host for our clients. We encourage a conversational, pain-point focused and warm intro where your product fits naturally. 

11. Network and connections in London

This might be point 11 but its super essential. Having links, a strong network of decision makers and connections with vendors is an unfair advantage. Many companies don't consider the headache behind finding venues that not only fit the type of event but accommodate various dietary restrictions. Also, many event marketing companies have strong relations with venues, if you decide for whatever reason to postpone the event, the flexibility is there. It's a good idea to ask which events they have in their portfolio. 

Having a strong network base is also crucial. Our delegate team have a huge network of decision makers we're well connected with. As a neutral party we can.

Conclusion

The truth is, there’s no universal “best” — only the agency that best aligns with your objectives, your ICP, and your definition of success.

But if you’re looking to host high-impact B2B events in London that:

• attract real decision-makers (not just attendees),

• respect the nuances of UK buying culture,

• comply fully with GDPR,

• and convert conversations into booked sales meetings,

then your choice of agency matters more than the venue, the menu, or even the guest list.

London is one of the most competitive B2B event markets in the world. Buyers are busy, selective, and allergic to sales theatre. The agencies that succeed here don’t run “events”, they design strategic, outcome-driven experiences.

At ConvergeX Connections, we specialise in curated executive dinners, roundtables, and invite-only B2B events in London built around pipeline, not vanity metrics. From sourcing senior decision-makers to guaranteeing post-event meetings, our approach is designed for companies that want measurable ROI , not just a packed room.

If you’re considering hosting a B2B event in London, the real question isn’t if you should do it, it’s who you trust to do it properly.

And as for soggy scones?
Still unacceptable. 😉