A quick look at the FAQ shows that you need at least 2000 reputation to edit other people's stuff. On the main site, when you edit, you're submitting a recommendation that the moderators need to approve. That's likely why you can't see an edit link on Meta.
That said, on Meta it doesn't hurt to add another answer. You could just have easily submitted a new answer listing WordCamp Jerusalem, or just left a comment asking someone to add it to my answer. In any case, it's now added to my answer.