We have a family get together every Christmas. We have a family do every Easter. We had to have a family meeting to discuss the situation. (Meeting - usually a more formal reason for getting together). Where is our Christmas do this year? (Office Christmas meal) It was a posh do. The dress code was formal. (Formal dinner). The stag do was held in the local pub. (Pre-wedding celebration/get together for the groom and friends). The hen do was held in the local pub as well. (Pre-wedding celebration/get together for the bride and friends).

Have a do Going to the do It is not often used.

I think it might be British English casual speech, yeah. I'm in Canada and never hear anyone use it, but I feel like I've heard it on BBC shows, maybe. =P I think I've also heard of 'a to-do' which might be where that's from. As in, a large event might be a 'great to-do'. EDIT: Ah right, and yes you can definitely say 'have a meeting/get together with family.' The main thing is a meeting has a more serious connotation than a get-together, which is generally implied to be more casual/fun.