I did an ETA but I don't know if anyone saw it and this is becoming more epic so, here we go, separate post.
Apparently Zac was supposed to go to cheese fondue at Lt. Dangle's house.
But as you can see, something came up. Something being time at Rob Dyrdek's Fantasy Factory.
eta: just to be clear, i'm sure tom is just fine with whatever happened. we all know zac isn't a douche so i'm sure it's all good, hakuna matata.
eta2: another pic: