A social event put on by an organization having some form of
authority over event attendees where those attendees are
generally confronted with the dilemma of attending the social event or
facing some generally undesired consequence.
A: "Sorry, but I can't go to the
beach with you this weekend. My employer wants
us to attend this team-building retreat. If I
don't go to the retreat, I'm required to show-up at my workstation and perform my duties."
B: "Oh, so they want you to have some mandatory fun, huh? It's okay!"