Something that I've been meaning to do when I get my game up and running again is to use Season and Episode Aspects. Basically I put an aspect on different plot arcs, the Season Aspect lasting for multiple gaming sessions and the Episode Aspect lasting for one session, and then I would allow something like one free tag of each Aspect per session. It allows me to control the themes and mood of each session in a fun and useful way.
I like this idea, Though Season Aspects just seem like threats and themes to me. As for Episode Aspects, it seems like you're just giving out a random bit of player power, but for no real reason. Not that there is wrong with that, but it doesn't really seem to add anything much it self. Maybe it will serve to keep players cognizant of the theme of the night but I see it more just devolving into a mechanical +2 when the players are in trouble
Will you be compelling it? Can NPC's invoke, Compel and Tag it? Is there a mini-game associated with it in anyway, where the players get to guess at the aspect of the scenario and the first to guess gets the free tag?