I found a free web calendar (see www.luxsoft.eu) which keeps the data on the own site (this is strictly required).
My knowledge of PHP is not existant, so I’ve no idea how to integrate this tool into a site using grav. As far as I understood the recipe on including own php-functions works for function which return one “string”. The viewing pages of the calendar (monthly, etc) don’t seem to work like this…
Next idea: using plain iframes. This works, but is not very responsive.
Any idea on how to integrate the calendar-views into a grav site would be welcome.
(e.g. Is it possible to make an iframes height responsive?)