M. B!
Hope I'm not too late!!! When Bob and I married - we married in the courtyard of the hotel and had the reception in the same place....
I've only been in invited to one wedding where we weren't invited to the reception - it was a tad awkward - but we understood - she had a HUGE (600 people) wedding and couldn't feed them all - so ONLY FAMILY was invited to the reception...
However, there are some weddings that are having the reception on another day....who knows!!! :) Just go expecting the reception to be at the same place...that's what I would do....
However, if it's a small wedding - may they have many happy years together - they may be having it at the same place....if they don't and no one says anything - take advantage of having the baby sitter and go have some fun with the hubby!!!