I don't like cities and crowds aren't a favorite of mine either, so I'll probably never attend one of President Trump's rallies. On the other hand, I have a good idea of why they're powerful from TV and from a New York Post article by Miranda Devine.
Devine went to the recent New Hampshire rally and writes an excellent, very positive account of the great skill with which the Donald does this event. He is a natural, he plays the audience like a concert master with a Stradivarius.
If, like me, you're unlikely to drag your backside to an arena to watch him perform, read her article and enjoy the experience vicariously.