The meeting page says meetings are the first Tuesday of each month except January, unless it falls on the 4th of July, between 7 and 9 PM. The homepage says the St. Louis club posts monthly meeting location and timing, member finds, and metal detecting regulations. Source: https://gatewaymetaldetectingclub.com/meeting-information/
The map pin is the published meeting address. Meeting times change. Confirm with the club before you visit.