The idea of Favorite points was introduced as a recommendation for future visitors, after many local communities already presented something similar (GC vote, best caches bookmark lists, ...), which was the only way how to differentiate poorly hidden box on the corner of the street from well prepared caches bringing you to awesome place.
This does not apply for events -- there will be no future visitors once the event ends and the listing is disabled and archived.
As a side effect of this, collecting of FP became also part of the statistics, where would certainly the event points fit, but it is already done this way as a cache indicator, not the cacher indicator. As already said, it is not possible and I don't think it is going to change.