Great questions.
1.) Yes please prewash, certainly at the least anything that might run.
2.) Sending ahead is fine, you send to scrap_lover09, so if you finish quite early just drop her a PM and ask if she minds if you send it right away. I'd say anytime after the 15th of Jan. is good though.
The unasked questions: :lol:
~Don't write anything on the outside of your envelopes what is inside. As some of us already might be aware, crooks know the value of a quilt. If you can afford to swing it, get a tracking number. We don't want any tops lost.
~Don't forget to include your quilt label for each person in your group to sign as we pass your row around. As simple or as fancy as you'd like. A fabric that matches your row with a Sharpe will do in a pinch. ;)
At least one of the PM's I sent I said "your block" is due out by the end of the month. That's my bad, It should have said "row"