Ok, here’s what we’ll do to save you a bunch of clicks if you have a big stockpile of melted snowballs to exchange:
EDIT: New, more betterer plan - just contract me your snowballs in Luminaire VII (Caldari Prime) - Moon 6 - Federation Navy Assembly Plant for 0 ISK ahead of time if you want and I’ll contract back fresh snowballs. (Should have made this the plan from the beginning but I’m not very smart.)
Otherwise you can still do this rather than contract:
- Bring your melted snowballs with you to Luminaire VII (Caldari Prime) - Moon 6 - Federation Navy Assembly Plant
- I’ll be hanging out in the station from around 19:00 EVE time on Sunday.
- Open a trade window with me and give me your stockpile of melted snowballs.
- I’ll use dev space magic to exchange them for fresh snowballs at a 10:1 ratio and trade them back to you
Sorry but I have to stick with the 10:1 ratio. Since the snowballs are part of the “economy” of the ongoing 13 Days of EVE event it might break things if I did 1:1 but you should still have plenty of snowballs for the fight.
If you have a smaller quantity of melted snowballs please use the Yoiul Festival Snowball Exchange structures to swap them for fresh ones. And of course make sure you log in every day to claim fresh snowballs in the meantime. 
I hope this solution is acceptable for you guys! It’s a bit inelegant but with only 1.5 work days at CCP before the event we don’t have time to work out an in-house solution for you.