Not everything happens on the water. Team events cover meetings, pot-lucks, volunteer shifts at a regatta, fundraisers, and season-planning sessions.
The difference from a practice: instead of claiming one of twenty identical seats, you claim a specific slot.
Examples:
You can claim more than one slot at a team event, and each claim takes its own note. Each slot has its own limit, so a popular one fills.
Claim the slot you can actually cover. Volunteer shifts in particular are what keeps a club’s race entry in good standing; when a slot sits empty, someone on your committee ends up doing it on top of their own day.