Audax rides

Does anyone know if you can ride a calendar event as a DIY? What I mean is to ride it on some other date but as it's already been registered as a particular distance you don't need to apply for it as a DIY. For example if you rode a calendar event and enjoyed the route but didn't want to wait till the next scheduled event and also wanted to get your audax points.

Haven't booked it yet but pretty sure I'll be doing the Windmill Ride as my first 200.

Tomorrow London to Brighton. My own route (not BHF) written out audax style with a group of about 6 others.

I'm riding that one. Will you be on fixed or gears?