[Courtesy of download.com]
iOS or MacOS users have recently found their Calendar infested by fraudulent invitations -- the problem exploded over Black Friday weekend. Spammers exploited a loophole in Apple's iCloud's default settings, which allowed senders to bypass email and push calendar alerts directly to Apple iOS and MacOS users' Calendar app. The trouble is that unlike spam email, you can't just delete or block these invites; your only options are Accept, Decline, or Maybe. Do not choose any of those options: They notify the spammer that your account is active, which can then open the door for more spam. But never fear, there are two workarounds that can delete the spam you already have and let you block future invitations.
Delete spam Calendar invitations