The brainchild of a quartet of Downtown Littleton retailers — Marsha Asheim, Sue Coffey, Peggy Cooper and Amy Doherty — this distinctive market sprung right up along the town's Main Street during its first go-around last year, an attempt to bring back the spirit of A Paris Street Market, which began in the heart of the Littleton business district before moving to the roomier Aspen Grove a few years ago. The good news is that the market — more of an arts fair crossed with a sidewalk sale than a typical flea — worked. The Olde Town, which developed its own inimitable character during last year's run, will be back beginning in May with some experience under its belt and a similar mixture of new, vintage, girly and artsy wares.