We have been invited to the wedding and

Hello Rita! A very good question indeed, especially for a non-native speaker. We are working on what you could write and it will be on the website on friday (I will post the link here)! Thanks for bringing up this great question! Georgette: Italy Magazine 

In our village we just verbally tell our friends that we will be attending the reception once we have received the invitation - nothing written required. We are in Basilicata and the invitaions are always hand delivered by the bride or a family member. You are also expected to give cash at the reception in an envelope (the cost of enjoying the 8 hour party)

Hello Rita, we just published the article explaining how to respond,we hope you enjoy http://www.italymagazine.com/news/how-reply-wedding-invitation

Hi there! You can send a mail too informing yourfriend that you will come. Or, call your friend. It is not a big problem since most of us really make some allowance on the alloted visitors or guest that will come on special occasions.