This time, no API I couldn't find time and strength to do this 
(maybe after the event with statistical data)
iCLoud link for subscribe calendar is:
webcal://p60-caldav.icloud.com/published/2/Mjc4OTI3NzE5Mjc4OTI3N-csb0hk4CnoQ_NWGa9g-iEaCaq09lim1zZR73sjYuUfhZpdgg7PsVB33SO_S56qh9xDTIkGcqydk8tE-SBQh7s