Lightdesigner timed events

I need to add yearly timed events for a church that is dependent on holidays (such as Easter, Good Friday, etc.) which have no specific date.  Aside from adding each day for multiple years, is there an easier way to do this?  

Can you have an event last multiple days in the yearly recurrence?  Ex.  front columns red/white/blue from 7-1 thru 7-7 every year.

It would be nice for Lightdesigner to have a +(days) or -(days) from a day (holiday) in the Occurrence settings.   Ex.   Good Friday is -2 days from Easter.

Any help would be great.. thanks.

Dan