For those not familiar with the concept, the Multiverse Crossover Ficathon is a fiction exchange where writers sign up to write a crossover based on the requests of another writer, and get a story written for them in return. The crossovers involve a certain set of fandoms, all of which are space shows. (Except for the fandoms that are actually space books or space movies, but you get the idea.)
March 7th: Sign ups start.
March 21st: Sign ups close.
Sometime soon after March 21st: Assignments handed out.
June 31st: Stories due in.