In fact, I would think the best move would be for President-elect Trump to Tweet and make it official that any celebrity, musician, or other-wise supposedly famous person that issued hatred toward trump supporters is FORBIDDEN to be on any government grounds during any inauguration event as they have a proven track record of violence, domestic terrorism and mental health issues.
Stay on offense Mr. President-Elect. Double the punch not just one for one. Knock them out. Keep them out for 8 years.