Members of the Ventura County Astronomical Society will host the annual Telescope Users Clinic at 7:15 p.m. Fri., June 17 at Mesa Unions School multipurpose room, 3901 Mesa Road, Somis. The public can attend at no charge. Members will show guests how to properly use a new telescope. Guests can learn how to set up a telescope, how to use the different powers and eyepieces and how the mount works.