I manage two calendars for work and often have to make sure my calendar events exist on both so I don't get double booked. I wrote https://syncmycalendars.com/

I manage two calendars for work and often have to make sure my calendar events exist on both so I don't get double booked. I wrote https://syncmycalendars.com/ https://syncmycalendars.com/ to automate and simplify that process for myself and others.