This has been the process the past year or two or three.

There will be two dynos available, A and B. You're race class will be assigned one of them prior to your arrival. You can chose to dyno before the event if you chose on the dyno specified. You are not required to dyno prior to the event.

You may be asked to dyno after warmup, qualifying race, national championship race. If you are asked to dyno it would be on the one specified from the start.

So if CMC dynos on dyno A, thats the one you go to for the entirety of the event.

Hope that helps.