We are going to a wedding in less than a month. It's on of my best friends that I have known for more then 10 years. They have decided to throuw their wedding while we are visiting in California (we live in NY). It's a country style wedding ( not sure exactly what that means), but they have booked a venue that it's gonna be average $100 per guest. We are going with 2 kids. They are not doing a registry because they live in a very small house and don't have place for stuff. So I figured we'd give money. How much should we give them though?