Can you help me think of a word?

The organizer or the point person

Liaison?

Planner.

The fixer.
The negotiator.

Or go with @ragingloli‘s liaison.

Lee-yay-sohh

Training officer.

Communicator, messenger

Locutus

We use point person or point of contact like @janbb.

Coordinator.

Go-between

nexus

Initiator. Launcher. Usher. Originator. Inaugurator.

Party coordinator

facilitator
leader
master of ceremonies (M.C.)
mastermind
captain
marshall
spark
bridge

I particularly like some that others suggested, too: liaison, nexus, organizer

The word I was thinking of was liaison, which was what a few people mentioned. Thank you all!

Without reading the above answers, “coordinator” was my first thought.

I’d call her the organizer. She’s not a channeling information between the group as a whole and some other entity. She’s the organizer of the event and the connector among the participants.

Organizer or coordinator. In an activity as informal as dinner between 4 people/friends, liaison seems much too formal. I’d use liaison when talking about government/s or a large meeting between two corporations. That’s just me.

ringleader

Coordinator is like an air traffic controller or a choreographer managing many relationships. A liaison is like a go-between for 2 companies/groups/people.

I would say coordinator.

Liaison is like a representative of a company or group.

I know you were thinking of the word liaison. But I think event organizer or event planner is actually a better fit. :P

@raum was the event organizer for the mini-flutherfest in SF last month.

@LuckyGuy More of a group effort on the fly. :D