First of, I'd like to greet addy. Dude, I love your avatar Cartman. It just seems so funny (in an ironic twisted way) when you imagine it's actually Cartman giving all those advice about being buff and ripped, in that strange voice of his (I don't know how to describe it exactly).
I love Southpark, I think it's cool. And if I had kids, I'd really have no problem watching it with them!
Anyhoo, back to skinnyman.
Dude, I can really relate to you. For me, that doesn't even have to be limited to weekends... my shcedule is so erratic, thanks to being in a consultancy-type work. I also have days where eating seems so hard. During those times, I also did like OneMoreRep, I'd bring a thermos filled with atleast half a liter of a protein drink I like, so I'm sure I get good quality protein. If it's literally the whole day that is a "starve-fest", I'd gulp down good ol' protein drink before I go, bring atleast half a liter with me, then just bring some sandwiches made from wheat bread and whatever I can find to put on them, not necessarily protein rich because I can depend on the protein drink I drank and brought with me (at least until I get home and sit down for a late dinner).
I personally don't like depending on supplements, but during those times I can't depend on "real food", well, those supplements are a far better option than starving my muscles.
Hope this helps. Good luck!
-JV