Is the box office open on Sundays?

I would call

The box office is open when they have a performance or show. Calling the Asolo number directly can get you the most accurate info of their schedule.

Yes

You can buy ticket online but they charge "convenience fee". Incredible development. Online purchase should be cheaper, not punished wit extra fee!

I'm not sure, but online sales should be available

Don't think so

I don't know but you can go online to.reserve a seat