I need to set complex repeating event (e.g. first day of every 2 month). Anybody can shed light on how to do that? Or are there any third party apps which can make it happen? Thanks.
To make it happen, you'll need third party apps. There are apps available in App Store. For example, this app claims it can do that. And it is currently being featured on App Store. Here is the link: http://itunes.apple.com/us/app/calendar-tools/id438197022?mt=8