For one thing, nobody here can answer your question. Please contact support if it's important. But keep in mind that not all jams are approved for the calendar. Please don't rely on it. Do your own promotion.
How do I do my own promotion? Can I pay for advertisements somehow?
On itch.io? No. But you can post about it in Game Jams, or anywhere else online.
Do you recommend any sites I should use online?
Your usual hangouts? Other game communities? Simply finding like-minded people?
