Does anybody knows , on Sunday 10, in Bob hope theater, can I purchase tickets there? Thanks

You run the risk of the theater being sold out but yes, you can purchase at the box office

There is a box office but they may be sold out. I'd try to pre order or maybe call the box office at least to not miss out.

depends on the event. If this is for Friends of the Fox (Bob Hope) Theatre movie matinee, you can absolutely buy tickets there. If this is for a concert of some sort, then you have to purchase through some agent, such as ticketmaster.