Cheerful Twentyfirst

You can brief one agency for a conference, an awards show, a film or a brand activation, and ask it to report the event’s carbon as well. Its published work runs from a two-day staff retreat to five days of programming at Cannes Lions, so you can compare it with your brief before you call. Cheerful Twentyfirst is based on New Cavendish Street in London and belongs to Aeorema Communications plc, which is listed on AIM.

Services

You can keep strategy, production and film with one supplier, because its project list covers all three.

• Strategy and audience insight, using its Audience Playbook, which combines behavioural science, research and live event experience.
• Conferences and live events, including customer and leadership conferences, gala events, media events, internal communications events and product launches.
• Brand experience, including experiential activations, immersive experiences, installations and trade show exhibitions.
• Film and content, including brand film, moving image and creative campaigns.
• Digital and hybrid, including hybrid and virtual events, global broadcast, digital engagement and workshop series.
• Carbon and ESG reporting and sustainable production for client events.

Sectors and clients

You can test its record against your own sector, because it names its clients. It publishes no sector list, but its case studies cover advertising and marketing (Smartly, Stagwell), media and publishing (BBC Studios, The Wall Street Journal, Hearst Magazines, News UK), financial technology (Ramp), telecoms (Vodafone), construction (Chartered Institute of Building) and climate and environmental groups (ClientEarth, Climate Group). Its homepage also names YouTube, Google, Expedia, Instacart and White & Case.

Recent work

You get published figures to question. All are the agency’s own.

• ClientEarth brand retreat. A two-day event introducing a new CEO to staff, most of whom had joined during the pandemic. Carbon was estimated at proposal stage and measured after delivery, with changes to travel, catering and staging bringing a 48.6% reduction against forecast.
• Construction Manager of the Year awards. The Chartered Institute of Building’s first virtual ceremony, run from a London studio with 64 cameras and 56 videos. Over 570 people watched the 2020 winner announced. The agency says it has worked on these awards for over 30 years.
• Smartly ADVANCE. A multi-day customer conference and industry summit with sponsor spaces and a leaders’ dinner. The agency reports “attendance goal met by 140%”, deals closing 25% faster on average and a 70% uplift in average campaign value.
• SPORT BEACH for Stagwell. A Cannes Lions activation first briefed in 2022 and reworked for a fourth time in 2026, with 6,500 attendees, 42 athletes and five days of live programming.

Its pages on The Pavilion for BBC Studios at Cannes and Roku’s hotel suites at CES show its exhibition and hospitality work.

Company

You can read the group’s accounts before you appoint, because its parent publishes annual reports. Companies House shows Aeorema Limited, which trades as Cheerful Twentyfirst, incorporated on 23 June 1995, while the agency’s about page speaks of 40 years of work. That page lists offices in London, New York, Austin and Cannes. Its contact page gives street addresses for London (87 New Cavendish Street) and New York only. No team size or minimum budget is published.

In March 2026 it reported winning Experiential Agency of the Year and Creative Team of the Year at the Conference News Agency Awards, and it appears in the Power 30 Most Sustainable Agencies 2025-26. Its CSR charter lists EcoVadis (agency certified), Planet Mark (certificated), isla (founding agency), AdGreen (super user) and event:decision (measurement partner). Its 2023 environmental policy says it supports the Net Zero Carbon Events Pledge.

What to ask before you appoint them

• Who will run your event day to day? Aeorema’s annual report records a 33% cut in group headcount in the 18 months to December 2025 and says seniority increased, so ask for named people.
• What would cancelling cost you? The UK client terms on its site apply the same scale if an event is cancelled or postponed: deposits kept, plus 50% of the agreed budget more than 180 days out, rising to 100% within 30 days, plus items the terms call PCNs. Ask what PCNs are and whether this scale will apply to you.
• Which carbon target applies to your event? The 2023 policy commits to Net Zero by 2030. The 2025 to 2027 charter pledges a further 24% Scope 3 cut by 2030 and Net Zero by 2050. Ask for the before-and-after measurement ClientEarth received.
• How were the results measured? Ask what baseline sits behind figures such as Smartly’s deal speed, using our guide to measuring events and these proposal questions.
• Who finds the venue? The group lists venue sourcing under a sister company, Eventful, so ask whether it is in your fee. Our venue guide can help.

Related on Events Review

• Event production and brand experience agencies
• Conference venues in London
• Live Group
• Strata
• Collider
• Sledge
• Identity
• emc3

Sources: cheerfultwentyfirst.com, Aeorema Communications plc and Companies House, checked 3 November 2026.