Family Program. “LamaSeuss Series: The 500 Hats of Bartholomew Cubbins.” 11 a.m.-noon, Oriental Institute, 1155 E. 58th St., 773-702-9507, oi.uchicago.edu, free. Participants explore the museum’s hatted artifacts to learn what ancient hats can tell archaeologists. Children must be accompanied by an adult. Recommended for children ages 5 to 8. Required registration at oi.uchicago.edu/order/classes.