co-organizer
nounUK /ˌkəʊˈɔːɡənaɪzə/
US /ˌkoʊˈɔːrɡənaɪzər/
A person who helps plan and run an event together with someone else.
Maya was the co-organizer of the school talent show.
OTHER MEANINGS
2. Someone who shares the job of arranging a meeting or activity with another person.
The two teachers were co-organizers of the science fair.
3. A helper who works with the main person in charge of putting something together.
As co-organizer, he booked the hall and sent the invitations.
4. A partner in setting up a group, club, or project.
She became a co-organizer of the neighborhood book club.