Each Friday for the last couple weeks, a modest but attractively designed wooden cart has rolled out at Milk Market, the Denver micro-district that aspires to turn its Ballpark-adjacent block of Lower Downtown into a model food hall and social hub for the 21st century. Its wares? Unique experiences. No, not holiday gift certificates that invite you to get high and paint mediocre pictures in a room full of strangers, nor ones that allow baby goats to climb on you while you struggle to complete yoga poses (also in a room full of strangers).