UBS and Best Buddies International presents the Eleventh Annual Miami Gala: Brazilian Carnival, an evening of fundraising, entertainment and celebrities. $400. Details: (305) 374-2233 or www.bestbuddies.org.
American Nicaraguan Foundation, a non-profit organization that helps the underprivileged in Nicaragua, hosts Essence of Nicaragua Gala. Proceeds benefit American Nicaraguan Foundation. 7 p.m. at InterContinental Hotel, 100 Chopin Plaza, Miami. $350. Details: (305) 374-3391 or www.aidnicaragua.org
Historical Museum of Southern Florida presents Overtown Walking Tour and People's Bar-b-que lunch. Noon-2 p.m. $20-$25. Details: (305) 375-1621.
University of Miami presents the 15th annual holiday dinner Frost Choral Union. 7 p.m. at Jungle Island, 1111 Parrot Jungle Trail, Watson Island. Details: (305) 284-4162.
Carrfour Supportive Housing, a non-profit that provides permanent housing and services to the formerly homeless, hosts its annual luncheon honoring Miami-Dade County Commission Chairman Bruno A. Barreiro. 11:30 a.m. at Jungle Island, 1111 Parrot Jungle Trail, Watson Island. RSVP required. $125-$1,500. Details: (305) 274-4772.
Culture in the City presents Relationships & Your Brain with guest speaker Maureen Duffy, professor at Barry University. 7:30 p.m. at Arts & Minds Center, 3138 Commodore Plaza, Miami. Free: Arts & Minds' students with valid identification; $5-$10: others. Details: (305) 752-9595.
DawnTown 2007, is an annual architectural event held during Art Basel Miami Beach. This year's event features guest speaker Ricky Burdett, urbanist and principal design advisor for the London 2012 Olympics. 10 a.m. at Miami Dade College, Wolfson Campus, Chapman Conference Center, 300 NE Second Ave., Miami. RSVP required. Details: (305) 237-3222.
Miami-Dade Chamber of Commerce hosts second annual Doing Business in Paradise gala. The event includes a cocktail reception, dinner, entertainment and award ceremony honoring vice-president and news and programming director of NBC-6 Yvette Miley, CEO of The Peebles Corp. R. Donahue Peebles, and radio personality and president of Reach Media Tom Joyner. 7 p.m. at The Sheraton Miami Mart Hotel, 711 NW 72nd Ave. RSVP by Friday. Black-tie. $100-$1,250. Details: (305) 751-8648 or www.m-dcc.org.
Historical Museum of Southern Florida presents Fisher Island & South Beach boat tour. 10 a.m.-1 p.m. $37-$42. Details: (305) 375-1621.
The Innovation Foundation hosts a cocktail reception for The Dream Big Festival 2008. 6:30 p.m. at Blue Martini, Mary Brickell Village, 900 S. Miami Ave., Miami. Details: www.dreambigfestival.com.