How to dodge the baby questions?

I have a family event to go to this weekend and I know we are going to get all the usual "when are you going to have a baby" type questions. We have been TTC for over 2 years (no one knows) and I had a miscarriage last year (again, no one knows). A part of me wants to open up and let everyone know, more so to get them to back off a bit, but I don't know how to go about it. Firstly, I don't know if I want to open up at this event, so if I decide not to, I needs suggestions on dodging and responding to those questions and comments. Secondly, if I do decide to mention it this weekend, I need suggestions on what to say and how to get the point across that I don't want to be asked all these questions.