Kevin Brownlow, the dean of silent film historians, describes the final reel of the 1924 silent Girl Shy, in which actor Harold Lloyd commandeers every sort of conveyance to get to the church and stop his girl from marrying someone else, as "excitingly shot as the chariot race from Ben-Hur." See filmdom's most agile comedian and wonder why they don't make laugh-out-loud comedies like this anymore. 8 p.m. Discovery Green, 1500 McKinney. For information, call 713-400-7336 or visit www.discoverygreen.com. Free.