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Re:Decision for 2020-21 Academic Year by danaliv on Monday July 06, 2020 @08:13PM (#23754260)
This is called “auditing” and you don’t even have to sneak in to do it. You just ask.

https://en.m.wikipedia.org/wiki/Academic_audit

Re:Decision for 2020-21 Academic Year by vkou on Monday July 06, 2020 @09:09PM (#23754577)
If you ask, it costs money. In many cases, as much money as just being an enrolled student, and taking the course.