I wrote something similar (Lunchtime.io) as a way for the Open COVID-19 Initiative to relax with other members. One issue I found early on was that people would wait for ages to get into a call and leave. So we solved it by letting people pick times which suit them, showing how many people had picked that time, receive email reminders when that time approached and once the time came up, we’d give them a link. made things so much smoother and i had some incredible talks with people although… it was v awkward sometimes.

That being said, project got sunsetted because open source projects always make way for priority so love to see people love this.