Writing etiquette question

[nonionay]

So I've written a short story which I'm going to submit to a market with a May 15 deadline. May 15 is also the deadline for a workshop I'm participating in, and I was thinking of submitting the short story to it as well. The market says they'll report in a week if they're holding or rejecting a story. The workshop's in a couple months. I suspect it will get rejected, but what if it isn't? Would I be a bitch, making people crit a story that just got sold? ...even though it probably won't sell?
I might be able to churn out another short story for the workshop, since I don't have anything else ready at the moment.
Should I submit the story to both, or should I suck it up and write another short?