We were playing a game of 7 Wonders with the following expansions: Cities, Leaders, Great Projects (comes as part of the Babel expansion).
At the end of a particular round, we ran in to a conflict in regards to how to resolve effects that occur simultaneously.
One player had played a card that forced each player to discard a certain amount of gold (I believe it was related to the number of military victory tokens).
The other player built a stage of his wonder (Halicarnassus B) which allowed him to build a building out of the discard pile.
The building he chose was of the type required by the Great Project. He just needed to pay additional gold to get a participation token.
The conflict was that if he resolved the other players effect first, he wouldn't be able to participate in the great project. If he resolved his effect first, he would just need to take debt tokens.
I went through the rules and couldn't find anything obvious stating how to resolve these kinds of conflicts. Does anyone know how this situation should be handled?