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Because of the stupid default settings, spammers can add their calendar to your Google calendar. The solution is well documented, but as a reminder, if you want to prevent this:
Settings/Calendar Settings
In the 'General' tab, locate 'Automatically add invitations to my calendar' and choose
Quote:
[x] No, only show invitations to which I have responded
If some a-hole has already posted a load of events in your calender:
Settings/Calendar Settings
In the 'Calendars' tab, press the 'unsubscribe' link next to the calendar you want to remove.
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