Meetings are currently with "Meetings abstimmen" and "gebuchte Meetings" and the calendar very complexe. I suggest the following improvements:
a) the date should be noted with the day of the week (otherwise we risk to book on a weekend day or we have to go back to the calendar)
b) the calendar should have the possibility to "load" automatically country specific dates (Day offs etc) This should be directly linked with the "Meeting abstimmen" (it would avoid bookings on strange days)
c) it should be possible to group meetings (ie meetings with the same topic should have a possibility to "group" the same type of meeting
d) Meetings infos should have a grafical overview with indications or even better to combine calendar with data information
e) the email@example.com will be handle from different provider as "mass-mail/spam". Therefore the email confirmation does not reach every time the invited person.
I think it is important to adapt such "comon used" application.