To suggest a place for an event:
Create an appointment
Click on "Pick a place"
Insert the address or the place you want in the "Location, Address, Skype, Phone" field (physical or virtual place)
Choose the location from one of the options displayed below the search bar
Suggest one or more location options for the appointment
If you wish to remove an option, click on the red button to the right of the added option
Click on "Save" at the bottom right of your screen