The √ indicates admission is $5 or less, or free. Full-price admission is listed; the * denotes discounts (or free) for students, seniors, military, members, children and/or advance purchase. Call venue for details.

SPECIAL

√ Mardi Gras/Fat Tuesday Celebration, with entertainment, Brazilian samba parade, jazz, blues, specials and more; 5 p.m.; Aloha Tower Marketplace; free; www.alohatower.com.

√ "Mardi Gras - Carnaval 2008," block party, with parades, entertainment, floats, dancers, food, contests and more; 6-10 p.m.; Nu'uanu Avenue; free; www.myspace.com/nuuanuavenue.

OPERA

"Don Carlo," Hawaii Opera Theatre; 7:30 p.m.; Blaisdell Concert Hall; $29-$120; 596-7858, www.hawaiiopera.org.

ETC.

√ "The Future of Alzheimer's Disease: Diagnosis and Treatment," presentation by Dr. William H. Thies, vice president of medical and scientific relations in the Alzheimer's Association; 10:30-11:45 a.m., repeats 6:30-7:45 p.m.; Alzheimer's Association, Ward Warehouse, second floor; free; reservations: 591-2771.

√ "Valentine Cards With Jocelyn Lopez," 6:30-7:30 p.m.; Kahuku Public & School Library; free; 293-8935.

Digital photography techniques, with Keoki Stender; 6:30-8:30 p.m.; Waikiki Aquarium; $12*; 923-9741, www.waquarium.org.

ONE-TIME GIGS

Voodoo Lounge Party, featuring Molokai Jazz West and DJ; 5:30-8:30 p.m.; Don Ho's Island Grill; 528-0807.

Mardi Gras Madness Party, with Cerro Negro, Espiritu Libre, Zanuck Lindsey and Rock Hard Hawaii; 5:30 p.m.-1 a.m.; Gordon Biersch; 599-4877.

Mardi Gras celebration, with The Chris Vandercook Band; 6-9 p.m.; Dixie Grill, 99-016 Kamehameha Highway; 485-2722.

Pre-Grand Opening Celebration, Mardi Gras themed decorations and jazz/blues entertainment; 6 p.m.-2 a.m.; Rum Fire, Sheraton Waikiki; 922-4422, www.hawaiipacificentertainment.com/mardigras.

Songwriters open mike, featuring WuT; 8 p.m.; OnStage Drinks and Grinds; 306-7799.

Cerro Negro, jazz; 8-11 p.m.; The Dragon Upstairs, 1038 Nu'uanu Ave.; 526-1411.

Bringing Back Kerouac, featuring Sumoha Jani and Tui Scanlan with open mike poetry, dance and music, hosted by Kathy X; 8:30 p.m.; Anna Bannana's; 946-5190.

Kaleidoscope; 9 p.m.; NextDoor; 548-6398.

Mardi Gras Party, With Cherry Clossom Cabaret and DJ Shadowfaxxx; 9 p.m.; Mercury Bar.

Analog; 9 p.m.-1:30 a.m.; Irish Rose Saloon; 947-3414.

DANCE VENUES

Anthony Ryan Band; 7 p.m.; Panama Hattie's; 485-8226.

Suga Suga Pop-Lock It-Drop It, with James Coles and His United DJs; 7 p.m.-12 a.m.; The O Lounge; 479-3008.

Hot Latin Tuesdays, salsa, merengue and reggaeton, 18 and older; 8 p.m.-4 a.m.; Zanzabar; 924-3939.

Kingston Town, reggae with DJs Gonzales and Vince; 9 p.m.-4 a.m.; Fashion 45, Waikiki Trade Center; www.fashion45hawaii.com.

DJ Dancin' Adam, country and classic rock; 9 p.m.-4 a.m.; Nashville Waikiki; 926-7911.

Bombasstic Tuesdays, with DJ Mike D, 21 and older; 10 p.m.-4 a.m.; Pipeline Cafe; 589-1999.

You're Trippen!, with The Men of Heat, 18 and older; 10 p.m.-4 a.m.; Venus Nightclub; 951-8671.

LOUNGE ACTS

Cory Oliveros and Sara Noyle; 7:30-9:30 a.m.; ResortQuest Waikiki Beach Hotel; 922-2511.

Imai and Friends; 3-7:30 p.m.; Coconut Willy's; 923-9454.

Haumea Warrington; 4-6 p.m.; Duke's Waikiki, Barefoot Bar; 922-2268.

Mike Keale, Hawaiian; 4-7 p.m.; Waikiki Beach Marriott, Lo'i Lounge; 922-6611.

Ellsworth Simeona, with hula; 4:15-7:15 p.m.; The Royal Hawaiian hotel, Mai Tai Bar; 923-7311.

Ku Ha'aheo, with Halau Ka Waikahe Lani Malie, Halau Kahulaliwai, Na Keiki 'O Ka Waikahe Lani Malie; 4:30-6 p.m.; Waikiki Beach Walk fountain stage; www.waikikibeachwalk.com.

Fred Yuen and Joe Yuen; 4:30- 8:30 p.m.; Shore Bird Restaurant & Beach Bar; 922-2887.

Ray Sowders, traditional, contemporary Hawaiian, slack key; 5-6 p.m.; Hyatt Regency Waikiki, Elegant Dive; 923-1234.

Freesound, reggae and easy listening rock; 5-7 p.m.; Tiki's Grill & Bar; 923-8454.

Kelly Boy and Kalena DeLima; 5-7 p.m.; Holokai Grill; 924-7245.

Meleana Brown, Kimo Artis (upper deck) and Solanna Higa, Bobby Kini (lower deck); 5:15 p.m.; Navatek I, Pier 6; 973-1311.

Starr Lutu, Lenny Keys and Del Choy, jazz; 5:30-8 p.m.; Star of Honolulu; 983-7827.

Unwind, Kapala Trio with hula; 5:30-8:30 p.m.; Westin Moana Surfrider, Banyan Veranda; 922-3111.

Stephen Inglis, Hawaiian and slack key; 5:30-10 p.m.; Ola restaurant, Turtle Bay Resort; 293-0801.

Rico, blues; 6 p.m.; Arnold's Waikiki; 924-6887.

Polynesian Show, with Tava'esina; 6-8:30 p.m.; Sheraton Waikiki, poolside; 922-4422.

Jason Uesato, guitar; 6-9 p.m.; Cassis by Chef Mavro; 545-8100.

Noly Paa; 6-9 p.m.; Sheraton Waikiki, Cobalt Lounge at the Hanohano Room; 922-4422.

Soul Bucket, Hawaiian; 6-9 p.m.; Waikiki Beach Marriott, Moana Terrace; 922-6611.

Backyard Pa'ina, with hula; 6:15 p.m.; Sheraton Princess Kaiulani, poolside; 922-5811.

J.P. Smoketrain, blues, contemporary; 6:30-9:30 p.m.; Planet Hollywood; 924-7877.

Sharene Lum, harpist; 6:30-9:30 p.m.; Michel's in the Colony Surf; 923-6552.

Fire-knife show; 6:55 and 7:55 p.m.; Sheraton Waikiki, poolside; 922-4422.

Christopher Lau and Walt Keale, 7-9 p.m.; Hula Grill Waikiki; 923-4852.

Danny Hee and friends, slack key and easy listening; 7-9 p.m.; Roy's Restaurant; 396-7697.

Robert Cazimero, with hula; 7-9 p.m.; Chai's Island Bistro; 585-0011.

DNA, contemporary; 7-11 p.m.; Chart House; 941-6660.

Betty Loo Taylor, piano; 7:30-10:30 p.m.; The Kahala, Veranda; 739-8760.

Kelly De Lima 'Ohana; 7:30-10:30 p.m.; The Royal Hawaiian hotel, Mai Tai Bar; 923-7311.

Cult Classic Tuesday, classic sci-fi, monster, kung fu, Hitchcock mystery, Sherlock Holmes and Hollywood starlet movies; 8 p.m.; Bar 35; 537-3535.

Dirty Purple, contemporary rock; 8 p.m.; Arnold's Waikiki; 924-6887.

Jon Osorio and Steve Brown; 8-10 p.m.; Aku Bone Lounge. 589-2020.

Jeanette and John, contemporary, old standards, Hawaiian, jazz, rock; 8-11 p.m.; Hilton Hawaiian Village, Shell Bar; 949-4321.

Juke Joint; 8-11 p.m.; Hilton Hawaiian Village, Tapa Bar; 949-4321.

Kevin Mau; 8 p.m.-12:30 a.m.; Coconut Willy's; 923-9454.

The BBC, rock; 8:30 p.m.; Hanks Cafe Honolulu; 526-1410.

Liquid Courage, rock blues; 8:30 p.m.; Tsunami's; 923-8848.

Sonny Silva, jazz and classical guitarist; 8:30 p.m.; Brasserie Du Vin; 545-1115.

The Wrath of Jazz, with Toyz of Pleasure; 8:30 p.m.; Indigo Eurasian Cuisine, Green Room; 521-2900.

Eric Lee; 8:30-10:30 p.m.; Sheraton Waikiki hotel, poolside; 922-4422.

Shawn Ishimoto; 8:30-10:30 p.m.; Westin Moana Surfrider, Beach Bar; 922-3111.

Bruce Hamada and Jim Howard, jazz; 8:30 p.m.-12 a.m.; Halekulani, Lewers Lounge; 923-2311.

Christian & Sani; 9-11 p.m.; Tiki's Grill & Bar; 923-8454.

Brendan and Dewing Time; 9 p.m.-1 a.m.; Kelley O'Neil's; 926-1777.

BTR; 9 p.m.-1 a.m.; O'Toole's Irish Pub; 536-4138.

Soul Wind, blues and Latin jazz with Freddy Jones, Diego and Don; 9 p.m.-2 a.m.; Jazz Minds Art & Cafe; 945-0800.

Joe Kingston; 9:30 p.m.; Sheraton Princess Kaiulani hotel lounge; 922-5811.

Ellsworth Simeona; 10 p.m.-12 a.m.; Duke's Waikiki, Barefoot Bar; 922-2268.

Karaoke; 10 p.m.-1:30 a.m.; Fusion Waikiki; 924-2422.