If you do it right, there is no better date night than a Caps game in DC.
Trying to park in Chinatown is expensive, a nightmare, and more often than not they block off the streets to access the garages. The Metro will take you straight to Gallery Place, or you can park in another part of the city and walk your way to the game - walks on dates are hugely underrated, and I'm not sure if you've heard, but there are a couple of things worth walking past in the Capital.
You mostly need to be concerned with the teeny, tiny bag policy at Capital One Arena so that you don't get held up at security and miss warmies (which would completely ruin the evening).