The Godot Wild Jam overlaps with your "festival" and ends right as your jam starts: https://itch.io/jam/godot-wild-jam-33
Perhaps it would have been best to coordinate to only have one jam, or showcase the already-existing event instead of launching another Godot-only jam? People are unlikely to start a game jam immediately after finishing another.

Hey remram,   

We contacted GWJ and sent them our timeline but received no response.  We were not aware of when their jam would start, so we went with what it says on their website which is that it runs for 9 days starting on the second weekend of every month. So we scheduled this jam to start an entire week after that, but apparently this month they are beginning on the 3rd weekend of the month. While this is unfortunate as we do not wish to compete with GWJ or make people decide between one jam vs the other, we will not be changing the dates of the GoGodot Jam as the dates do not overlap.