Fine Arts

Maya 2012: Lords of Time. The origins of intricate Maya timekeeping systems are an integral part of the Penn Museum of Archaeology and Anthropology's exploration of a civilization that flourished, with cities already in existence by 500 B.C., in what is now southern Mexico, Guatemala, Honduras, Belize, and El Salvador. At 10 a.m. Saturday, Porfirio Lobo Sosa, president of Honduras, will join Penn Museum director Richard Hodges at a ceremony to open the exhibition.

— Sally Friedman

Exhibition hours: 10 a.m. to 5 p.m. Tuesdays, 10 a.m. to 8 p.m. Wednesdays, 10 a.m. to 5 p.m. Thursday through Sunday, through Jan. 13 at 3260 South St. Timed tickets, which include admission to the rest of the museum, are $22.50, $18.50 for ages 65 and older and military, and $16.50 for students (full-time with ID) and children ages 6 to 17. Information and tickets: 888-695-0888 or www.penn.museum/2012.

Family

The Official Star Trek Convention. Trekkies will descend on Cherry Hill on Saturday and Sunday for the 25th anniversary celebration of Star Trek: The Next Generation. Scheduled to attend are stars Patrick Stewart, Jonathan Frakes, Brent Spiner, and LeVar Burton. On Saturday night, there is a Star Trek musical performance with Tim Russ, which requires a separate ticket ($15).

— Matt Huston

Hours are 10 a.m. to 6 p.m. Saturday, and 10 a.m. to 5 p.m. Sunday at the Crowne Plaza Hotel, 2349 W. Marlton Pike (Route 70), Cherry Hill. Free parking. Tickets are $30 on Saturday and Sunday; $5 for children Friday and $15 on Saturday and Sunday. Children age 6 and younger free. Information: 818-409-0960, www.creationent.com.

Film

New this week: The Avengers (ssfd) Captain America, the Hulk, Iron Man, and Thor team up with Black Widow and Hawkeye to do battle with a demonic, demented Norse god (Thor's bad-seed brother) in Joss Whedon's effects-driven Marvel superheroes smash-up. With Robert Downey Jr., Chris Evans, Chris Hemsworth, Scarlett Johannson, Mark Ruffalo, and Samuel L. Jackson as their boss, SHIELD agent Nick Fury. PG-13 (violence, adult themes.)

— Steven Rea