In the weeks building up to Edinburgh, there are OVER NINE THOUSAND comedy previews a day. Finding the best ones can be difficult. So it's a good job that Londonist knows its comedy! Go to at least four of these shows this week: Monday 14th: This Sketch Show Belongs to Lionel Richie proved themselves expert at guerilla advertising at the Fringe last year, when hundreds of stickers bedecked lampposts, toilets and vending machines declaring......