group availability finder

https://alpha-wiki.win/index.php/How_a_Free_Scheduling_Tool_Can_Replace_WhenFor.us_for_Group_Availability

You know that nagging feeling when you're trying to coordinate a meetup with friends and nobody can agree on a time? A group availability finder takes the headache out of scheduling by letting everyone submit their free slots, then highlighting the overlap so you can finally pick a date that works for all.