do universities accept late enrollees for this fall semester?

Yes, if there is no one on the waiting list that is more qualified.

Yes, if it is a community college.

Yes, so long as they still have places in their class. Some universities have firm end dates, but many universities offer rolling admissions. So long as you are a qualified applicant, they’ll let you start if they have a place available. It’s worth calling the campus and speaking with someone in admissions.