[Alivia]

I agree with what everyone has said previously.
This year, the Midwest Regional, where I volunteered, was set for the date I had one of my midterms. I let my professor know during the first few weeks of class that I would be missing that day, and I was worried about the midterm. She was extremely nice about it, and let me take it early.

Like people have said, just make sure you tell your professor about it early (this coming week would probably be best), and remind them early and often about your absence and need for special accommodations.

Good luck!!