How do I do this one!?!

Yesterday was undoubtedly the worse day working ever!! I go out to get a coffee and I get my head ripped off and a new asshole! Apparently I fucked up last weekend, tell me how, I was just following directions from my supervisor! So anyways I called this morning to the other job that I just got and I can start right away if I want to, ummmm not really! I have a conference to go to this weekend and so I'd kinda like to do that instead!! I'll have to wait and see I have training today for the contract job that I took as well. Ahhhhhh these are the choices everyone would love to have wouldn't they!!!