MartialMatch is affordable and easy to use tournament software for combat sport events.
You may be able to compete without a BJJ belt. Before signing up, check the rules for the event you want to enter.
Which category should I choose?
If you're new to grappling, look for a beginner or white-belt category. If you've trained judo, wrestling, MMA, or another grappling sport, don't assume that the white-belt category is right for you. Some events restrict it for experienced competitors, even if they don't have a BJJ belt.
Check the event page
Start with Event information on the event page. The organizer may explain which category to choose and link to the event rules there. If you're still unsure, contact the organizer before registering. Tell them what you've trained and whether you've competed before so they can help you choose a category.