Back with some preliminary findings - [OK] Time Tree: a (basic) shared calendar will fill up the requirements quite nicely with reccuring events and nice views

Back with some preliminary findings - [OK] Time Tree: a (basic) shared calendar will fill up the requirements quite nicely with reccuring events and nice views of who will attend which events - [KO] Calendly: which provides interesting feature to set up the events, but no view of who is going to attend when - [KO] DigiCal, another shared calendar but could set up properly/simply a shared calendar