There are a number of ways a rehearsal period begins, whether it’s a silent read through/memorization period. Or a feeling out session.
A direct stumbling through.
Or a rap session about what exactly the director sees with the characters in the piece.
Sooner or later, however, there are going to be some disruptions. One of the more important of these is the music session. The band splits up and each member takes a show. They then visit with the director and discuss ideas for what kind of musical coverage the piece needs.
The band then gets together to discuss the various shows and what it is that they will need to rehearse for the remainder of the day.
Got that? Now, multiply it by seven.