We have officially scheduled baby Marionberry's christening at the Catholic church, but I'm really unsure of the etiquette of christenings (as I'm the first to have a baby in my family) - especially when it comes to the celebration.

1. Who do we invite?
2. Is a party afterward required? If so, do you serve a full meal, hors d'oeuvres, desserts or what?
3. Is there anything else I should know?

Thanks for the help! And pictures of your own Christening events are appreciated too!