https://support.google.com/calendar/answer/6110973...
Report inappropriate calendar invites or events
If you see a suspicious invitation or event on your calendar, report it as spam.
First, report the event as spam
Don’t reply to event invites from your phone. Instead, follow the directions below to report the event as spam on your computer.
When you report one event, all events from that organizer will be removed from your calendar.
How to report an event:
On your computer, open Google Calendar.
Double click the event you’d like to report.
At the top, click More Actions and then Report as Spam.
