you can post it any time during the week, but we won't be retweeting that specific pairing until the specified day. unless you decide to do multiple pieces with the same ship and submit one for the free day on wednesday, in which case we ask you to please post accordingly so we know which day it's for! we will also accept late entries (ex. if you are busy monday but want to participate in that day's theme, we'll still rt your late entry). hopefully this answers your question!