If you've never heard a bunch of tubas (in our case this year, 340+) playing Christmas carols, it's time you rectify that situation. It's called Tuba Christmas, and it began in NYC 35 years ago and has grown to now being performed all across the US, as well as a couple of events in Canada, and one in Switzerland. Believe it or not, it is very mellow and quite beautiful - and lots of fun. My son has played tuba since he was 9 (he had to hold it sideways on his lap then), and he first played in the DC event in 1986, when we came to this area.
It is held in the grand lobby of the John F Kennedy Center for the Performing Arts, and the audience sit on the floor (all very well till time to get up! lol) If you look closely, you can see an example of the tubists' bow - holding the BIG brass up in the air. With that many people with huge horns, there's no place to put the tubas if all the players try to bend in a real bow! It was a great time once we got there - I don't drive into DC at night much any more; and the Kennedy Center is very easy to find, but it's a bit tougher to find the entrance to the parking lot. So we parked in the Watergate (yep, that Watergate) across the street.
Check the locations - if there is a Tuba Christmas performance near you, try to catch it - you'll have fun.