The Fine Print
Many major cities have symphony performances in the daytime. Matinee shows are inexpensive, less crowded, and have a bunch of cute old people that you can make up stories about to each other.
The Built-In Benefits
Culture, beauty, and refinement all wrapped up in a neat little package. If this date idea speaks to you, I'd definitely recommending giving it a try.
The only downside to this date is the physical intimacy potential. Unless you don't mind grandma and grandpa seeing you and your date canoodling, it's a bit hard to do much more than hold hands during this date. Fortunately, it scores quite well across the board and is definitely brag-worthy. Just wait until her friends hear about how classy you both are!