If you're planning a team offsite and want an easy, delicious way to feed a group, but you don't want the expense of a private chef, we recommend bringing a paella vendor in. We've done this, and it's a great way to feed a team and have them enjoy the cooking experience in the process.
The paella vendor will typically set up a few hours ahead of time and cook the paella on-site. This setup works very well in our back yard or on our dock (assuming the weather is warm enough, which it easily is between March - September). You can also have the vendor set up on the deck and eat inside if the weather is too cool (although we also have patio heat lamps for the dock).
There are two vendors in the Bay area we recommend: