SEMI Easter Conference 1993 was held at a school in Innsbruck, Austria by Scoopex, Energy and Manitou (hence SEMI) for the Amiga scene. This party is known under several names; it is often referred to as the SCX-NRG-MTU party, and the invitation intro referred to it as the Eastern Party 93. Facilities at the party included a 24h snackbar and pizza service, a party bbs and continuous showing of movies on a big screen. Competitions were to be hosted for demo, 40k intro, graphics and music; C64 competitions if enough C64 people showed up. Amiga entries needed to run on A500's with 512k chip, 512k fast and kickstart 1.3. Apparently, there was some destruction of property at the party, as the following quote from The Jungle #7 will tell you: "Arranging a party where lamers smash chairs and doors, destroy the toilets and then say it was a lame party, totally sucks!"
Photos available at http://ftp.amigascne.org/pub/amiga/PartyFlyers/SEMI93/.