Instagram/Sharon Horgan & Russell T Celebrity SXSW London's film lineup & keynotes revealed! Sharon Horgan, Russell T Davies & Tom Quinn headline. Explore the future of screen storytelling. April 1, 2026 AceShowbiz - South by Southwest has unveiled the first lineup of its world film program and keynote speakers for the upcoming SXSW London, scheduled from June 1 to June 6. The festival's Screen Festival segment will spotlight prominent creatives and executives from both film and television industries, highlighting their work and discussing the future of screen storytelling.