Boo!

Tonight's boldfaced parties:

New York Restoration Project's Hulaween gala. Waldorf-Astoria Hotel, 301 Park Ave., nr. 49th St., 6:30 p.m. Hosted by Bette Midler in honor of Willie Nelson; guests are scheduled to include Robert De Niro, Stevie Nicks, and Margaret Cho. Willie Nelson? Halloween? That's fucking sweet! If we were even barely a celebrity, we would definitely name-drop and doorman-badger our way into this bad boy. ("Come on, don't act like you never watched Viking Quest!")

Gotham magazine's Halloween Costume Bash. The Grand, 41 E. 52nd St., nr. Madison Ave., 8 p.m. Hosted by Rachel Weisz; scheduled guests include Sacha Baron Cohen and Isla Fisher, Naomi Watts, and Rob Thomas. Winner of the best-costume contest gets a ticket to an advance screening of Darren Aronofsky's The Fountain. Imagine how excited Naomi Watts must be about the chance to get into an advance screening of a movie!
• Radio and A Prairie Home Companion. Museum of Television and Radio, 25 W. 52nd St., nr. Fifth Ave., 5:30 p.m. cocktail hour and 7 p.m. presentation. Robert Altman and Garrison Keillor will be on hand, screening unused footage from the PHC movie and playing snippets of their favorite old-timey radio shows. We like Robert Altman and Garrison Keillor; they seem like the kind of people who, if you crashed their party and went up and asked them a question about, like, Hemingway or something, would get in a really involved conversation, tell the security guard trying to kick you out that you were their second cousin, then wink at you before continuing a fascinating anecdote about a letter that F. Scott Fitzgerald wrote to William Faulkner about A Farewell to Arms. Or at least that's what we like to imagine.

Or, check out our Agenda listings for tonight, selected by New York's culture editors.