A cub scout pack is organized into dens - usually, one den per grade level. In each den, the scouts will work through a curriculum, organized into adventures, which gives kids immersive experiences learning life skills.
Most of your meetups will be with your den, but Packs also get together regularly. And those tend to be where the big events happen - things like Pinewood Derby and Bobby Crocker.
Learn about Cub Scouting at scouting.org/programs/cub-scouts