I am going to end this discussion.
Like it was said before, but the Rule Book specifically states an event may not be played outside of its phase.
Bilbo, Bearer of Things Burgled does not circumvent that rule; rather, it allows you to play an
elligble card during that phase. I liked
the Balrog, Flame of Udun example. Even though Bridge of Khazad-Dum allows you to play the Balrog, it does not take away other conditions necessary to playing
Flame of Udun.
To continue re-hashing already-made points, there is no rule that states that Conditions may only be played during the Fellowship phase; however, that is the only phase that actively let's you play them without another card allowing you to play it (such a
Treebeard, Keeper of the Watchwood).
Here is another example. If you have
The Tale of the Great Ring in play, you may not use Bilbo to play another copy during the regroup phase because there is a specific rule regarding unique cards. Bilbo says "play a tale" but as I said, it is required that the Tale is elligible for play.
Events are not elligible for play outside of their phase. Thus, you cannot play
Nine-Fingered Frodo and the Ring of Doom in the Regroup phase.
-wtk