Autism covers a lot of ground as an overall label, and there could be other reasons for the behavior you describe. I am not sure why you are asking. Do you have some concern for your own child?
The Americans with Disabilities Act prohibits discrimination for challenges like autism, and if the child has a 504 or IEP, I imagine the school and parents will work together on a plan to make this possible, without impacting anyone else.
I have a kid with type 1 diabetes. The school had to change the class trip to accommodate her. For most trips or events, I had to go along. Legally the school should not have required that but my participation was the only way to keep her safe.
A person who is on the spectrum and high functioning would be a lot safer than my daughter, but perhaps the parent is planning on going along.