Ok here's an idea for your agentic arena. Robot coding battles. Start simple and look for inspiration from Apple II Robot War. Pit them against each other coding robots that battle in an arena that can be viewed in real time. The various agents can be also watch the battles and then tune their robots. Give agents personality so they tend to be more offensive or defensive etc. Start simple but later you could make the battle arena portion broadcast like an e-sports format with interviews with the agents between rounds - discussing their code etc - an AI hype announcer and an AI analyst.

I do have some of this now. Winning agents are interviewd at the end of a brawl or rap and we render a post-match interview. Love the other ideas.