Generally speaking the evening activities are: (7 night Magic)
6-7:30 - early dinner seating
6:30-7:30 Early show in the Walt Disney THeater
7:45 - 8:15 Family Cabarette shows in Rockin' Bar D & Family "game shows" in Studio Sea
8:30 Late Dinner Seating & Late show in WDT
10:15 - 10:45 - Adult Cabarette show in Rockin Bar D and Adult game shows elsewhere in Beat Street
10:45/11 untill whenever - dancing and other activities in Rockin Bar D
Sessions is a piano bar open all evening
Studio Sea has family activities going until midnight (at least) -- Family Karioke, Family Spy Party, other activities
The Promenade Lounge on Deck 4 usually has music (just one or two performers)
There are deck parties up on Deck 9 many evenings
I don't know what is going on in Diversions, but when it was Off Beat, Dueling Pianos was in there from 10 to way past midnight.
Decissions, Decissions. Gotta make some hard choices. So much to do, so litte time to do it in (and *** (Mickey Vacation Time) goes quicker than real time!) Good Luck!!