This is exactly what i did. I was tired of throwing parties for a bunch of stupid drunks, so me and my buddies had a straight weed party. We had grav bongs set up and people from all over town showed. There were a few people who smoked for their first time that night and all 60 people would cheer. I knew it was successful when someone would ask where the alcohol was and everyone would just look at them like they were out of their minds. Good thinking, the party was a huge hit.