Dress rehearsals are full run-throughs of the show, without interruptions, usually with costumes and makeup. There will be an intermission. After the dress rehearsal, the Director and Stage Manager will give notes to the company.
We have a dress rehearsal on the Sunday of tech weekend, as well as a dress rehearsal on the Monday of the week of the show; on the Monday the curtain goes up at 8:00 pm, just like on the show nights, so actors should arrive at 6:00 pm, and the tech crew should arrive by 7:00 pm. By the time we are done the rehearsal and have gone through notes, it may be 11:30 pm or midnight.
Dress rehearsals take place in the Humanities Theatre in Hagey Hall. There will be other rooms in Hagey Hall available for studying and resting when you are not on stage. During one of the dress rehearsals, you will have the option of watching the show from the audience.
Yes, attendance at dress rehearsals is mandatory.
If you really really really can't make it, you should talk to the Stage Manager.
You should bring water. You also need to bring some makeup equipment, namely eye-liner and a washcloth. Since you will be moving around a lot in an enclosed area, please take care of your hygiene (showering, deodorant) for the comfort of everyone in the company.