Laurie -- I noticed that the special event 1x1 callsigns should be handled a bit differently.
Probably something like having an expiration time on B4 detection. Since these things are only good for a short while and the events change constantly.
So having a pull down with maybe a 30-day default for B4 detection would work.
So those that want to work these don't ever get alerted a 2nd time for any specific call once you work any particular one.