That's okay: the conference is not intended to go anywhere. The US wants to convince people it's interested in a peace: so it's holding a conference. Israel has to please the US: so it has to come. Both parties want to build up Abbas as the leader of the Palestinians (although he isn't), so he has to be there. To get him to come, the Syrians have to be invited. And there we are. However, that doesn't mean that anything will be accomplished, or that anyone even wants anything to be accomplished. It's like one of those social functions where none of the guests actually want to be there -- but haven't much choice in the matter.
Death toll from Yemen rebel attack rises to 55 after 10 Saudi troops killed (AP)
from the article: PA: Police deployed in Nablus before receiving Israeli okay