Remind?  

http://www.roaringpenguin.com/products/remind  

You should be able to do clever things with that.  
>  Mon Sep 08 2014 10:17:08 AM CDT from "gregrwm" <tclug1 at whitleymott.net> 
>Subject: [tclug-list] know a more clever calendar?
>
>    google calendar is fairly clever, it can understand for example "lunch
>meeting 11:30am 2nd and last saturdays monthly".  but "my event 10am second
>sunday after the first monday in september" is beyond it.  anyone know a
>calendar that *is* that clever?  (ie able to properly specify formulas like
>for easter or the harvest moon..)
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