We recommend joining the official RPG Maker discord here: https://discord.gg/8TZDDgPked. We’re currently discussing the possibility of adding a dedicated game jam section.
Viewing post in Game Jam Community Discord
As stated in the rules:
Engine Requirement: You must use Gotcha Gotcha Game's Maker series engine (Official Site, Steam, Epic Store). Games made in other engines are not eligible for this jam. Each mainline Maker engine has a trial version with full features, while RPG Maker Unite's trial is only available for a limited time.