Watch spotted hyenas open their holiday gifts at Miami MetroZoo. Through Sunday. 3 p.m. at 1 Zoo Blvd., 12400 SW 152nd St., unincorporated Miami-Dade County. Details: (305) 251-0400.
Vizcaya Museum and Gardens hosts a tour of Vizcaya at night with classical music performed by Encore Chamber Players. 6 p.m. at 3251 S. Miami Ave., Miami. $10-$15. Details: (305) 250-9133 or www.vizcayamuseum.org. STRONG-MAYOR DEBATE
The Urban Environment League of Greater Miami hosts the Miami-Dade County Strong Mayor Debate featuring Sen. Gwen Margolis and Miami-Dade County Commission Chair Bruno A. Barreiro. 6-8 p.m. at American Legion Hall, 6445 NE Seventh Ave., Miami. Details: (305) 532-7227.
Miami Beach Botanical Garden presents a lecture on Flowering Trees. 10 a.m.-noon at 2000 Convention Center Dr., Miami Beach. Free. Details: (305) 673-7256, ext. 203. HISTORY CHALLENGE
Historical Museum of Southern Florida hosts the fourth annual History Challenge with Paul George. 2-4 p.m. at 101 W. Flagler St., Miami. Free. Details: (305) 375-1621.
Miami Metrozoo hosts a cat adoptathon. 11 a.m.-3 p.m. at 12400 SW 152nd St. unincorporated Miami-Dade. Details: (305) 251-0400.