Can you purchase tickets ahead of time and can we get reservations for a specific day in August?

You can purchase tickets ahead time. With their current covid protocols you will have to choose a specific half hour window when you want to come. Once you are in you can stay for as long as you want. Regarding booking now for August, I don't think they do reservations so far in advance

You can purchase tickets ahead of time but it appears from the website that they are currently only going thru the end of March at this point in time.

Yes, you can order online but idk the calendar goes. You may be able to book for August