Open Google Calendar or Office 365, create a meeting once or twice a week for 30 minutes and call it "watercooler chat". Make sure staff know it's an open forum

Open Google Calendar or Office 365, create a meeting once or twice a week for 30 minutes and call it "watercooler chat". Make sure staff know it's an open forum, and that anything can be discussed safely. People that want to show up will. People that don't wont. Modern problems require modern solutions.