Saw a huge run club at Hermann Park today, anyone know which one it is?

I was taking graduation photos at Hermann Park today (around sunset) and saw a really big run club probably 50+ people all running together near the trail area. I’ve been trying to look it up online but can’t figure out which group it was.

Anyone know what run club that might’ve been or how to join it? It looked really fun and I’d love to be part of it!