When you create an event for multiple people in Google Calendar, you usually want to choose a date and time when all of the people you want to invite can attend without rearranging their own agendas.
If your guests have shared their calendars with you, Google Calendar can make this task easier for you by suggesting times that work for everybody.
First, create your event, and fill in as much of the data as you can:
Now select the people you’d like to invite to the event. (For demonstration purposes I’m only inviting one person here, but when you’re inviting numerous guests this feature can save you a lot of time wading through their appointments).
Now you can simply click on the Suggested Times link, and Calendar will open a dialog listing the times and dates when everybody can attend without creating clashes. Simply click on your preferred time and date to select it.
Don’t forget to save the event when you’re done.