That's good idea. Most matches are booked because of a rp would go to that direction or needs to match to make the storyline complete etc. However, we are forced to make some matches despite a possible rp or the lack of one so the idea of posting the card as matches go before hand is a good idea.
Hopefully, the GM would agree with me. So, let's say the show is in tuesday, everything should be done by monday. That would mean the card would be posted here on friday so that everyone would have time to write something and to know what the character is expecting in the show.