I think that Sept 30th will be busy for a number of reasons.
- It's a Sunday, not a weeknight
- EPCOT celebration
- Runners, and friends/family in town for Sat. night run
- Tower of Terror fanatics in town for run/after party, who love Halloween.
- Far enough into the school year that parents are comfortable pulling kids out of school
- beginning of Food and Wine
- when I called through
DVC the person I spoke had only sold tickets for the 30th so far, mine for the 28th were the first different ones.