this is a nice idea! unfortunately, i have a packed week and i won't be able to participate
i do have an idea how to lessen the possible inflation that comes with such event: make the additionaly earned food a sub-currency, that can be spent only in the Shops (within a time limit, as not to let additional currency stay permanently on the site).
as to why: i love many shop items, but when i do save up some food, i usually spend it on the marketplace, because i've just seen a sweet deal on something i wanted. and the shop items that are on my wishilis get postponed from buying.
such an event would be an incentive to actually spend food in the Shops!