When can or can you not play an event without a legal target? For example:
I'm pretty sure that you can't play a "To be" event without a target just for the standing effect (or maybe it's just To Be a Dragon?)
I'm pretty sure that you can't play a Hatchling's Feast without three characters on the board.
So when else can't you play events? Example from play that mattered:
I'm running KOTHH and preplot ambush in a character obviously setting up for Rule by Decree. My opponent plays an event (I forgot the name, but the Greyjoy one that lets you recur a location from your discard and put it into play by paying its cost). Since there are no locations in his discard, does he get to play the card for no effect or is he precluded from playing it? And, more importantly, how do you know when you can or can't play an event?