Giving Up Punctuation for Lent

My friend Katy's father, Denis, sent in this sign from the Stop & Shop in Braintree:


The main problem with the sign is that Lenten, an adjective referring to Lent, is spelled wrong. The apostrophe and the "s" are superfluous because Lent doesn't really own the specials, but it might not be technically a catastrophe. An apostrophe sin, perhaps?

Thanks, Denis!