I'm hoping to attend the NAEYC conference this year and was thrilled to find out it's being held at Anaheim (because three, maybe four, trips in one year is apparently not enough for me

). The conferences take up a big chunk of the day. Here's the link to the conference schedule:
http://www.naeyc.org/files/conference/file/2010/10_Prelim.pdf
While there are some smaller workshops/set up going on earlier, the main conference registration doesn't start until November 2nd and the opening ceremony with the keynote speaker isn't until the evening of November 3rd. I suspect most people will be arriving sometime on Wednesday and attend the keynote from 4:30 - 6:00. On Thursday 11/4, Friday 11/5, and Saturday 11/6, the first workshops of the day start at 8:30 and don't end until 5:00 (5:30 on Saturday). Even the lunch break in between sessions is only an hour and only the most dedicated person

wave2:

) will be running over to the parks for a quick ride or to pick up a fastpass. Then on Wednesday and Thursday night, the park will likely close at 8:00, so I can't see a bunch of conference people springing for a park ticket for what would amount to maybe two hours of park time (unless you have an AP

).
There's nothing in the conference material so far about the availability of twilight tickets, though I suppose they might be offered. On Thursday night, there's a special event for conference attendees (for an additional fee) at DCA from 7:30 - 10:30. There might be more of an influx on Saturday night or Sunday, but I bet a bunch of people will probably fly home on Saturday night since more people will be paying there own way to the conference this year than in years past (when the agency/school district/facility might have had funds for conferences).