To my knowledge, anyone can create and run a campaign at any time. There is no need to ask permission.
How to Start New Group Builds / Campaigns
A bunch of campaigns are set to kick off on January 1. Most of them last a full year.
Fortress in the Sky: B-17 at 90
Got Hitched
Korea: 1950 to 1953
M113: Jack of all Trades
Tiger Battalion
A bunch of perpetual campaigns also typically reset on January 1 and run for a year.
Hanger Queen XV
Hot Out of the Molds 2025
Sci-Fi and Alternative History Campaign XI
Unfinished Business 2025
Workin’ on the Railroad 2025
If you have an idea for a campaign and are willing to act as the event coordinator, or can find another person to fulfill that roll, go for it. 
Whoa. Slowly backs away