I do not believe the java api includes access to event gold..so you would have to either write it or you would need to find another method to inject directly into the flat-file Berkeley db...of which no safe method exists as of current and you cannot safely do so whilst the db is live.
Im guessing your planning on setting up donation for event gold, perhaps even using gshop1 for a donations type store (at 1 point i had the same idea), if so, i would advise you simply create a event gold based item as it would be the safest option.