Democratic Underground featured a thread begging people on DU to register for free tickets to President Trump’s rallys and then not attend in order to reduce attendance there. Some bragged that their cat was registered etc. Yes - that is how little they are.
An easy fix for that is to say you must be there 30 minutes in advance. If not, then someone else will get your seat.
Give it to the people that could not get a ticket, and let them fill the remaining seats.