In the Lord of the Rings co-op game, you can discard quest cards with stars on any activity track since they are considered wild cards; however, when an event requires you to discard cards with a specific type (travelling, hiding, friendship, or fighting), can a quest card with a star be discarded instead?
Firstly I will point out there are two versions of the game: Fantasy Flight and the Original
The FAQ states:
Example: The Event cost at Speak Friend and Enter requires the players to discard a Friendship and Joker symbol. Frodo volunteers since he can discard any two white Hobbit cards to pay for the cost.
Frodo's ability is the same as a wildcard (or Joker as this edition calls them) and therefore I would say it is clearly correct in this edition to use a wildcard in this manner.
Fantasy Flight (Current)
The Rulebook states:
Some cards have star symbols, which are wild. These may be played as any Activity symbol (Fighting, Friendship, Hiding, or Traveling).
It doesn't give a specific example like the older edition but given the older edition allows the usage of wildcards for events it would seem logical that it is still allowed.