Each week, former sf.myopenbar.com editor Allie Pape brings you her picks for the best places to booze on the cheap in SF. This week: Halloween hijinks, Hall of Famers, and an endless happy hour. Have an event coming up? Want to share a tip? E-mail her.

1. Free Drink in Costume: The new Marina Vietnamese joint, Three Seasons, is aggressively courting the cheap drinker; in addition to their prime-time happy hour, which we featured last week, they're also offering a free drink to anyone who shows up in costume on Halloween night. Besides the free booze, we're enthusiastic about the idea of pho as a gastrointestinal base for the evening's festivities. Be sure to make a reservation, though-- it's still Saturday night, even amidst the timeless revelry of All Hallow's Eve. (Saturday, October 31, 5-10 pm, at Three Seasons, 3317 Steiner St., Marina.)

2. Cab Rides Home on Halloween: Speaking of Halloween, and the fact that it's taking place on the already booze-soaked terrain of Saturday night: most of us are probably going to be getting drunk, and some of us have cars, so please remember not to mix your tippling and your Toyota. Instead, punch Luxor Cab's digits (415-282-4141) into your phone and make a note to tell them that Berg Injury Lawyers is picking up the tab. They'll take you home (and only home-- no free-cab bar crawls) when it all gets to be too much. If you're in Oakland, Berkeley, or Alameda for the holiday, you can get the same deal by calling Veterans Cab (800-281-4488). Again, be sure to mention Berg. (Saturday, October 31, 10 pm-4 am.)

3. Dubonnet Happy Hours: If you find yourself ever wanting to touch liquor again in the aftermath of the Saturday Halloween Massacre, Dubonnet is hosting some very nice happy hours at Eastside West and Orson. They'll be passing out "Dubonnet Dollars," coupons that will allow you to purchase Dubonnet-based cocktails for a mere $1. They'll also have free hors d'oeuvres and a raffle for a gift certificate. Note: Dubonnet Dollars are not legal tender anywhere else, so don't try to spend them in a Dubonnet-induced haze. Dubonnet. (Wednesday, November 4, 6:30-8:30 pm, at Eastside West, 3154 Fillmore St., Marina. Thursday, November 5, 6:30-8:30 pm, at Orson, 508 4th St., SOMA.)

4. Acme Chophouse Happy Hour: Another year, another Giants-less World Series. But while the matchup of Yanks vs. Phillies isn't thrilling to West Coasters, you can enjoy this week's games right in the shadow of AT&T by having a drink at the stadium's restaurant. They have $3 drafts, $5 appetizers, and wine and cocktail specials during happy hour, and of course, plenty of big TVs to catch all the Series drama. (Tuesday-Friday, 4:30-6:30 pm, at Acme Chophouse, 24 Willie Mays Plaza, SOMA.)

5. Maya Happy Hour: This fancy-casual Mexican restaurant is getting tons of Twitter buzz, and for good reason: their happy hour, which runs all night, is chock-full of incredible deals. $5 margaritas? Check. $5 mojitos in a rainbow of flavors? Double-check. $3 drafts? $2 tacos in another rainbow of flavors? Yup. They even give out complimentary snacks from 4:30 to 7. We don't know how they make any money, but we completely love these people. (Daily, 4:30 to close, at Maya, 303 2nd St., SOMA.)