American Association of Variable Star Observers (AAVSO)
Day/Time: Saturday and Sunday
Location: To be determinedSince its founding in 1911, the American Association of Variable Star Observers (AAVSO) has coordinated, collected, evaluated, analyzed, published, and archived variable star observations made largely by amateur astronomers and makes the records available to professional astronomers, researchers, and educators. AAVSO provides programs for amateur astronomers with even very modest equipment to make genuine contributions to scientific research.
Related site: http://aavso.org/