From what I understand, the convention center in Anaheim is very close to Disneyland. That seems very likely to have been a significant factor in steering the location of Celebration 7. As locations go, I know that there have been a lot of comments from fans who would like to see a Star Wars Celebration in their region. But with Disney in charge now I can see the methodology in keeping Celebration close to one of the theme parks.
As for the timing? It's actually in line with the timing of the first three Star Wars Celebrations, which were all scheduled just a few weeks before the release of each of the Prequel Trilogy movies. It may not be ideal to get away for families during the school year. But I can recall seeing plenty of families in attendance at both Celebration 2 and Celebration 3. If people really want to go, they're going to go.
I hope that Reed is going to stay on as the promoter. I like how they've built up New York Comic Con, although I didn't get a chance to attend the Star Wars Celebrations that they promoted. And I think they probably did a far better job than the promoters who did Celebration 2, 3 and 4.