5th Annual Bloodbath: A Halloween Party Wear red or a costume for free cover, with music by DJ Ants and a Pledge Cast show starring Kitana Gemini, Kai'ja Adonis, Demii Cache and Chevelle Brooks. Thursday, 9 p.m.; Revolution Nightclub, 375 S. Bumby Ave.; free; 407-228-9900; revolutionorlando.com.
Nicolas Feuillatte Champagne Tasting Sample the Brut, Brut Rose, Palmes d'Or Brut and Palmes d'Or Rose, as each will be paired with bites from the restaurant's chef. 7 p.m. Thursday; The Fifth, 112 S. Orange Ave.; $50; 407-649-0000; thefifthorlando.com.
Plazaween Halloween block party with costume contests, live bands and drink specials. 9 p.m. Friday-Sunday, 9 p.m. Wednesday, Oct. 31; Wall Street Plaza, Wall and Court streets; free-$10; 407-849-0471; wallstplaza.net.
DJ Mark Farina The Chicago DJ plays house, acid jazz and downtempo music. 10 p.m. Friday; Senso, 13 S. Orange Ave.; $12.50; 407-246-1755; sensosupperclub.com.
Oktoberfest The German-American Society of Central Florida hosts their annual shindig with live Alpine-folk music by Sonnenschein Express, dance performances by Schuhplattler Gruppe Alpenrose, Bavarian food and plenty of beer. 2-11 p.m. Saturday; German American Society of Central Florida, 381 Orange Lane, Casselberry; $5; 407-834-0574; gasocf.com.
Costume Changing Room Party Swap your old Halloween costume for a new(er) one, and enjoy free beer by Orlando Brewing, DJ music and dancing. 9 p.m. Saturday; Death By Pop-Up Shop, 1844 E. Winter Park Road; $5; 407-960-4745; deathbypopshop.com.
Pub Quiz: Halloween Edition Wear a costume and you'll get an extra point, then see how much you know. 7:30 p.m. Saturday; Bull and Bush, 2408 E. Robinson St.; $5; 407-896-7546.
Trick or Treat Night Halloween-inspired draft beers, bobbing for bottles contests and more. 6 p.m.-2 a.m., Saturday; The Gnarly Barley, 7431 S. Orange Ave.; free; 407-854-4999; thegnarlybarley.com.
The Fear Factory Massive Halloween party with more than 20 dubstep and EDM DJs, zombie foam parties, circus freak performers, haunted tunnels and more. 8 p.m. Friday; The Graffiti Warehouse, 618 W. Central Blvd.; $15-$50; wanttickets.com/thefearfactory.
Avenge the Night: Halloween Superhero Edition Superhero costume party with $4 themed shots, cash prizes for best costume and music by DJ Chino and Guess Jeans Marc Sparks. 9 p.m., Saturday; Touch, 55 W. Church St.; call for price; 888-455-2634; touch-orlando.com.
The Monster Mash Halloween-style happy hour event with '70s, '80s and '90s DJ music and screenings of classic horror flicks. 4-9 p.m. Sundays; The Parliament House, 410 N. Orange Blossom Trail; free; 407-425-7571; parliamenthouse.com.
Smile for Camera's Takeovr: OWLSA Tour with Kill the Noise, Jack Beats and more Halloween party with a lineup of dubstep DJs. 9 p.m. Tuesday; Roxy Nightclub, 740 Bennett Road; $15; bit.ly/owslaorlando.