If you're not sure what's involved, it's basically this:
it essentially works like a local bazaar or marketplace where fans can offer up or "sell" their services, such as graphics, translations, subs and more, for small amounts of money and others can "buy" them, with all the proceeds going into one account for donations.
So it's like help_japan, but specifically for Johnnys! So if people post in both places, you get the twice the chances to get something you want, and twice the chances to help raise money. :]
arashi_on are having two branches of their fundraiser:
1. Fandom services - eg fics, graphics, translations, art
2. A garage sale where you can sell physical goods such as magazines, concert goods, CDs, shop photos, crafts etc.
I've compiled a post of K8-related services already offered but now if you have something to offer, as well as money to donate, please do get involved! :D
The mods at arashi_on have been super-helpful and really efficient so please please help out in any way you can. :]