The spookiest thing about this Halloween is the number of party options available for girls and ghouls aiming to celebrate a haute haunt.

Below are just some of the sinister shindigs happening around town this weekend and into Monday night's official Halloween holiday. Check the CultureMap Calendar for more, and we'll see you tricks (and treats) out there.

Friday

Ghostland Observatory at Warehouse Live — Austin-based Ghostland Observatory, aptly named for the occasion, will play its second Houston show at Warehouse Live. The duo is famous for its raging shows — come in costume and don't be shy with the glow sticks. Doors open at 8 p.m.

Saturday

Bar Munich's Dirndls & Lederhosen Halloweenfest — Midtown's Bar Munich will celebrate with an outdoor biergarten party Saturday night stocked with Hofbräu beers, music by Das Ist Lustig, food from Frosted Betty and Wingfire Grill, a costume contest and more. Break out your das boots and get to carousing.

Fifth annual Montrose Pub Crawl — Meet your neighbors and fellow crawlers at 6 p.m. Saturday at Cafe Brasil to begin your trek down Westheimer to Poison Girl, Boondocks, Anvil, Etro Lounge, Catbirds, Royal Oak, Slick Willies and El Real Tex-Mex. There are no covers or tickets to buy, but there are drink specials and costume prizes awarded at each stop of the night. Beware the cameras — the massive annual crawl is documented online for antiquity.

Lady Bunny at Hotel ZaZa — Inimitable entertainer Lady Bunny will resume her annual post at Hotel ZaZa Saturday night for Za'lloween 2011. A $50 cover charge includes your first drink and complimentary valet. From 9 p.m. until close.

All-night Happy Hour at Philippe — Philippe Restaurant + Lounge's Saturday night celebration continues Monday with blood-red sangria for those who dare dress up and an all-night happy hour with special spooky pricing: $4 off all bar food, $2 domestics, $3 imports, $5 house wine, $5 wells and $6 specialty cocktails. Party in the lounge only from 5 p.m. until close.

Easter Seals Greater Houston BASH — Party for a good cause at this adults-only celebration at the Corinthian, featuring food and cocktails by Jackson & Co, music by crowd favorite Skyrocket and a to-die-again-for raffle. Tickets are $150 in advance and $200 at the door from 8 p.m. to 1 a.m.

Halloween at The Capitol Saint Germain —Introduce yourself to just-opened downtown The Capitol at St. Germain and have a bloody good time with music, half-price specialty cocktails and a costume contest from 5 p.m. to 2 a.m.

Sunday

Bering Omerga's Moulin Rouge party at Américas River Oaks — Bering Omega is the beneficiary of this Parisian Halloween party at Américas. Houston bon vivant Edward Sanchez hosts the fourth annual event, featuring a cocktail reception, David Cordua-created dinner and after-party. Tickets start at $150 or $50 for the after-party only. Drinks start flowing at 6:30 p.m.; the after party begins at 9:30 p.m.

Monday

13 Celsius' 13|31 with CultureMap — Join CultureMap for for a more sophisticated celebration (there's wine!) at Midtown's 13 Celsius on Monday. Texas Pizza Wagon will provide savory pizzas to be followed up with sweets from Happier Desserts. The affair goes from 5 p.m. through midnight and will feature GONZO247 of Aerosol Warfare creating an original work on two corner windows.

Sullivan's Steakhouse's Fang-tastic Halloween Costume Bash — Vamp it up at Sullivan's Steakhouse with creepy vampire-themed cocktails and celebrity judges awarding prizes for the crowd's most ghoulish get-ups. Dewars Scotch and Ambhar Tequila will both be on hand doing promotions and keeping guests sated. Dancers from the Fred Astaire Dance studio will keep the monsters mashing from 8 p.m. to the bewitching hour. Doors open at 7 p.m.

Halloween Unleashed at The Boneyard — This canine costume contest benefits the Houston Humane Society and includes treats, prizes and priceless photos of your pooch in his or her poshest Halloween-wear. Begins at 6 p.m. $10 at the door.