I am currently on a project management course, where I can at least eat the food. However the free food and shorter days than usual are the current main benefits, the other being learning what vocabulary my employers would like me to use for things I do ALL THE TIME anyway. I could probably do that in half a day, rather than four.

Unless there's supposed to be some team-building effect from sticking 11 people who mostly don't work directly together in the same room for 4 days.