We have a simple way of doing this for our one office of about 70 people. A message to slack the day before asking if you’ll be at the office the next fag and a hand up emoji if you’re going to be there.
The main problem with this is people forgetting to do it or not paying attention to it. There have been a few days I’ve gone in to find far more people than I’m comfortable with. How do you solve this problem?