I just noticed on the altadenablog a notice about JPL's upcoming Open House.
The 2010 JPL Open House will take place on Saturday and Sunday, May 15 and 16, 2010, 9am-5pm both days.
This popular event celebrates JPL's accomplishments with exhibits and demonstrations about the Laboratory's ongoing research and space exploration. Many of the Lab's scientists and engineers are on hand to answer questions about how spacecraft are sent to other planets, how scientists utilize space technologies to explore Earth and how researchers are searching for planets beyond the solar system.
The Open House is a fun and educational experience for children too, with special hands-on activities designed for kids. Admission and parking is free.