The phrase "principal organizer" refers to the main person or entity that plans, arranges, and manages an event, activity, or group. They have a central role in coordinating and making decisions to ensure everything runs smoothly. Full definition
Ely was one of the principal organizers of the American Economics Association in 1886 and its first secretary. (firstthings.com)
It was planned as a non-partisan tribute, and financed by donations, largely from Ulster County Sheriff Paul Van Blarcum, who suggested that the event be free as well as non-partisan, said Beth Murphy, a principal organizer. (hudsonvalleyone.com)
Quinn, a principal organizer of W.E.P. events, invited Krueger to attend the kickoff event in New York City for Cuomo's Women's Equality Bus Tour, which travels to Long Island today after stopping in three cities upstate last weekend. (politico.com)