i want to buy tickets at the May 11th price. Can i use them on a later date?

We went on a special price day and the tickets said we could only use them on the dates listed on the ticket.

No they are only good for that day unless you buy a season pass

They not only have free friend days,but also $10 bring a friend days for season pass holders..Best bet get on Social media and find a friend with season pass..