Do you know if the Windows are open to buy the Tickets?

They were open.

Depending on the event it may be too late to get tickets the day of the event. Unless you are nearby already, it's going to hard to justify traffic for purchases. As much as I hate convenience fees, in this case may be the best option if not the only option.

Usually 2hrs before showtime

You should call and ask, that's what I would do. I don't know what time or how soon before a show the box office opens. I do know that there are several ways to buy tickets you just need to find the best for you.