I love going to The Nash! It's never disappointing. Great performances and reasonable ticket prices. I recently went to the new Jazz and Poetry event with Holly Pyle and House of Stairs. It was phenomenal! A tribute to Donney Hathaway but a far cry from the usual 70's music retrospective.
Most times you can buy tickets at the door but they do sell out from time to time. They sell beer and wine and some snacks but no real food. If you go to Short Leash (they close at 9 pm)
next door you can bring your food into The Nash...it's cool. You can also bring other take out.
Not sure if you can still bring your own wine and beer. I'll find out next time.
Street parking is usually not too hard to find. If it's really crowded, there is a lot across the street from the venue.