Got the email from my TA that we can prebook on March 4 (March 2 for prior ABD guests). Lots of fun choices, so I figure we can't go wrong, but I do hope they have plenty of availability for the couple of excursions they offer. Would be disappointing if you have choice A or B, but only 1/4 of the guests can book B or whatever, though I understand venue restrictions. Just seems they should pick a different excursion that can accommodate more if that is the issue. We'll see! Either way, I'm sure we will have a great time.