Can I switch courses after registration?

No. Selectives are often small, intimate experiences, and seats are at a priority. If you vacate a seat, it might mean a course not making, someone not being able to take that course that you occupied or create a domino effect. This is why it is essential to be ready for backup options during registration and to monitor options.
Only if there are extenuating, unanticipated circumstances, can you contact Kirk Nuss to see about options.