Participants in Europe's largest technology conference next week will swap bracing, Guinness-fueled pub crawls by the River Liffey for some hilly, "Gothic grit and glamour" by the beach in mainland Europe's westernmost capital. The Web Summit, held in Dublin since its founding in 2010, opens in Lisbon on Monday and runs through Thursday. Often described as a "Davos for Geeks," the brainchild of Irish entrepreneurs Paddy Cosgrave, David Kelly and Daire Hickey will bring 50,000 people from 165 countries to the Portuguese capital. They'll network and listen to speakers including the actor Joseph Gordon Levitt and Sean Rad of Tinder. About 15,000 companies will be represented and 7,000 CEOs and business leaders will attend including Cisco Systems' John Chambers and Renault-Nissan's Carlos Ghosn.