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Depends on the priest, but it's likely you won't actually be discussing the wedding at the first meeting. More talk about marriage prep
Make sure to know your parent's full names, birth dates, and their religious preferences.
I know this seems silly, but DH was totally caught off guard (he doesn't have his parents' details committed to memory)
Our priest also asked for all of our educational and work details, as well as any religious education we've had.
Luckily I know all of that information for both of us because FI would probably blank out on that.
It's probably a good thing that he's not an expert in marriage prep . The first meeting with our priest was over lunch. Some people have a first meeting with the "freedom to marry" interviews (ours was towards the end).
@Agapecarrie is right - it varies from priest to priest. If he needs you to bring something like baptism certificate, he'll let you know.