When to buy or how to share float tube tickets for June 8 or 9

[Threeis420]

This might be a subject for the barret tickets page. I know these tickets sell out fast. My brother is coming to town for the first time in decades for my daughter’s graduation. I’d like to show him a good time. I know these tickets sell out immediately sometimes. We’d want to get on the water June 7 or 8. I’ll try to buy tickets and share my open spots or join anyone who has 2 open spots if they become available. I can’t even see how many spots 1 ticket can accommodate right now as they are sold out. I have only tried to buy tickets once and got lucky last year. I just don’t remember how this works.
Thanks in advance guys.