The Kusama exhibit at the Hirshhown has the crowds crazy. When the museum opened up ticketing for it, the Hirshhorn site crashed. And while I luckily got a ticket through the site, it took a long time to find a free slot. So get ready each Monday to try your luck on their site at noon
, when new free tickets go up for the following week (or join at a special reduced membership price and go whenever you want).
Even with the timed ticket that I had for this afternoon, the wait was about 45 minutes to get in, and then about 15 minutes to see one of the infinity rooms - given there are 6 infinity rooms, leave yourself plenty of time, or try for morning slots where the crowds might not have built up as much. And be prepared to enjoy each room quickly - you only get 25 seconds in each one. But it is so very very worth it.