I queried with Alton why my pass wouldn’t allow me to book anything after the end of June and was told they are releasing pass tickets in 3 stages where July tickets can be booked from end of May onwards.
Has anyone with a season pass been able to book tickets for any dates after end of June?
Yup there's three waves for ticket releases as follows:
Wave 1 – Released March 10th 2021
Attraction reopening date – June 30th 2021
Wave 2 – Released End of May 2021
July 1st – August 31st 2021
Wave 3 – Released Mid-August 2021
September 1st – December 31st 2021
There's no exact confirmed dates for wave 2 at present, they'll no doubt announce it nearer the time when restrictions (if any) are more clear.
Edit: I will say on a side note that it seems to be far better this year than it was last year, which is probably the booking restrictions preventing people booking every weekend for the sake of it. Looking a few nights ago, there was only the first weekend after opening and the Saturday after that was booked up so far. Everything else appeared to be still available, so much better job so far!