Wow, these Big Lebowski costumes are really put together well, man.
There are a lot of fun things to do to celebrate The Dude, one of the most memorable characters to hit the big screen with The Big Lebowski. A few of them include: getting drunk on White Russians, shopping for a new rug, or going bowling.
If you attend a Lebowski Fest event you can probably get all of these accomplished, and then some. I am sure you would be welcome with open arms. Walter Sobchak fans remember, no rolling on Shabbos.