I noticed some geocachers have logged FTF's on events, probably to boost their FTF-stats. Some accounts even organised various events in different countries and claimed an FTF on all of them. Of course, an FTF on an event doesn't make any sense. There is no 'glory' in showing up early for an event, just to claim you were the first person there. Especially since the event host will most likely always be the first, so it is not much of an achievement. I therefore think it would be fair to exclude all types of event caches from the FTF-stats. I know that FTFs on virtuals and earth caches can be disputed as well sometimes, but at least there is some sort of task that you can be the first to complete.
My guess is that it won't be too difficult to have logs on events from being excluded from the FTF tags, since they have a different log type (will attend/attended), but I'll leave that to the devs :)
Thanks for consideration and keep up the good work