In less than two weeks, Rainbow Hugs and Kisses: a Doomsday Celebration, the final closing ceremony/bye-bye art show at Secret Project Robot, will open as a “greatest hits” celebration of the last five years at their current space, 389 Melrose Street in Bushwick. Rachel Nelson, who co-directs the long-running DIY art and music venue with her partner Erik Zajaceskowski are moving on to their fourth (to be determined) location since the couple started an underground party place in Williamsburg known as Mighty Robot way, way back in 1998.