Tweet Charles Messier, and Planning a Messier Marathon Speaker: Don Machholz Friday, 04/21/17 07:30 PM Contact: Website: Click to Visit Cost: Free Save this Event: iCalendar Google Calendar Yahoo! Calendar Windows Live Calendar Tri-Valley Stargazers 1893 N. Vasco Rd Unitarian Universalist Church Livermore, CA 94551 Categories: Adults Astronomy/Space Sciences Lecture Teens (13-18)