The Share and Enjoy Amiga Conference 1990 was held at the Large Hall, East Croydon United Reformed Church in East Croydon, Surrey, England. It was a one-day party, from 10am to 10pm. According to my invitation text, competitions would be held for demos, graphics, music and playing the game Kick Off. Additionally, there would also be a bar and a video room.
Announced as going to happen on July 28th, 1990, in Stolen Data #3 - but ultimately was held slightly later, in august.