5:30 for most shows and if crowded you want to get there around them as most shows are GA and the best tables go fast.
Doors to the Box Office and Bar open at 5pm, doors to The Music Hall and dinner are at 6pm and the show starts at 7:30pm. This is true for pretty much EVERY show with a few exceptions. The few Flex Stage (all standing) shows the Box Office opens at 5pm but you are asked to go back outside until 6pm, and a very few shows have the show starting at a different time (such as New Year's Eve the show starts at 8pm), those different times are always marked on the schedule.
I suggest that you get there before 5 to get parking.
Try to be on Mount Vernon Ave by 5:00 pm. Remember that access to the music hall and tables is governed by your arrival and checking in.
Doors normally open at 5:30pm
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