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Recently I had a couple who create a Facebook Event for their wedding.  This was a first for me.  They did have invitations but this was a chance to invite people to share in their ceremony and just their ceremony since the venue had a size limit.  
Now while I fully understood this, it did make my heart beat a tiny bit faster when I learned of this.  The venue a different reaction and their heart might have stopped for a second. They were thinking about the food aspect of it all.  We didn't have an issue with inviting people to share in the ceremony but what if some of them came to the reception.  I hate to turn people away and didn't want any misunderstandings of course either.  For a venue to handle and extra person all of a sudden can be done, not recommended of course but I've seen it happen a few times.  My assistant and I have ended up sharing a meal because we gave ours to an unexpected out of town guest who decided to drive up at the last minute.  
In this instance though we could have ended up with about 35 additional people and didn't want any issues.  To avoid issues, we put an announcement onto the program, thanking everyone for coming and about the private reception to follow.  We felt it was the best way to handle it.  We did get 3 additional people who decided to attend anyways and they were super sweet about everything though.  They didn't demand a table and we ended up due to weather having a few people not make it, so it worked it out.  If you are thinking about doing something like this and making it a public event, make sure you let your vendors know before hand, like your planner and venue. Also make it clear to them what they are being invited too, and don't leave reception information onto the event board.  How do you feel about this?