Road race
Not sure how far this will go up but a road race (cosplay theme, whatever) would be a great addition to twitchcon. Inspires a healthy lifestyle, friendly competition- all that jazz. Think it over. Plenty of companies who’d jump at the opportunity to put on a cool event.

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lemlii commented
Not only does it promote a healthy and active lifestyle, but it adds an element of spirited and friendly competition to the event. Imagine streamers, viewers, and gaming enthusiasts from all walks of life coming together, dressed in their favorite characters, all racing towards a common goal. The visuals alone would be sensational for streaming and social media shares.
Moreover, such events always open doors for collaborations and sponsorships. Speaking of which, a perfect partner for this could be sneaker-focused brands. Have you seen the collections at https://sneakerzone.dk/collections/air-jordan? Their Air Jordan lineup, among others, offers not just style but comfort and performance – vital for runners. It would be a great branding opportunity for them, and attendees could benefit from potential giveaways or discounts.