Venue: "John Atanasoff" forum, Sofia Tech Park, Sofia, Bulgaria
Trolley busses 5 and 8 to the Sofia Tech Park stop.
Trolley bus 4 to the Aviation Square bus stop.
Bus 73, 84, 184 or 306 to the Sofia Tech Park bus stop.
Bus 305 to the Aviation Square bus stop.
Map of all routes (click to enlarge):