You will see everything after the parties are done on regular MK days. The only advantage I would see to you going to a party is that it is a hard-ticket event so less crowded and you could stay until midnight. I like late nights at the parks. But, you will still get to see the parade, shows, fireworks, etc. on regular days once the parties are done.
By the way, can I come too?? I envy your long holiday visit.