Not sure if all of Div A Conflict Groups have been published but typically it works that a student can only participate in 1 event in each group since all the events in that group happen at the same time. For the self-schedule events (usually builds) the kids just pick a time that they are free.
That being said it depends on the tournament setup and they may adjust it to avoid conflicts. One of the early draft of Div A (SoCal) had two inquiry events at the same time which didn't make sense.
You would need to check-in with the tournament director for the published event schedule to be sure.
Good luck!
-larry
Westpark Elementary SciOly