Help Spam in Calendar

[Lennatron]

So today I got a calendar event notification in the notification bar. It said winning notification and told me that I won and to visit lottomax.com. I have not installed any strange apps lately and today is the first day I got the calendar notification. I downloaded and did a scan with AVG but it detected no threats.

Attached is a picture of the notification.

 

[Harry2]

Have a look at the spam folder on your mail sever on the web.
If you'd find the same spam emails (with invitations) then these could caused the calender invitations.

Some times ago I saw a similar thread in AF.
Edit: Ahh ... found it
http://androidforums.com/showthread.php?p=6151450

Harry