About the Winter Music Conference in Miami- I went this past year and it was great. Sure, there were a few closed (private) parties, but the vast majority were open to the public and there was no problem getting in as long as you planned in advance. For example, Space sold a 3-day pass and with the pass you cut the line and get right in. PVD Friday night, Deep Dish Sat., and Tiesto Sunday. It worked out very well for me (a regular bloke). 2 am cut the line to get right in to see Tiesto spin a fab set until 7, then Sander K on the Terrace all morning. That was just an example.
Plan well, and it is GREAT! I was very surprised how good the WMC was. Similar feel to Ibiza.