Plan for the daytime, not just the night
The night mostly plans itself. The failure point is the eight hours before it, where a group either does something together or splinters into people scrolling in a hotel room.
Pick something that survives different energy levels
Anything that lets people participate at their own intensity works. Anything requiring everyone to be equally enthusiastic at the same moment does not.
Give it a structure, not a schedule
A rigid itinerary collapses the moment one thing runs late. A loose structure with a goal — get through this, in whatever order, by roughly this time — survives contact with a group of ten.
The photos are the deliverable
Whatever you do, the group will want the pictures afterwards and one person will end up chasing everybody for them. Anything that collects them automatically is worth more than it sounds.
Walkable is your friend
Rideshare for a group of twelve is misery and expensive. Something confined to a walkable area removes the logistics that ruin these weekends.
The bride does not need the most expensive option. She needs to not spend the day project-managing her own party.