Hi, Jim
it must be a relief to have your plan and get started. Eat lots of tasty food over the long weekend, and best wishes on Tuesday morning. My husband found that bring his Kindle along made the waiting for chemo, rads, blood work and so on a lot easier.
If possible, have someone with you for the first couple of Cetuximab infusions - it is possible that you may have an allergic reaction. The medical folks will be watching you carefully, but having 'designated' driver would be nice. If your significant other goes with you, make sure they have something to keep themselves occupied so they don't fret (or at least fret less).
You might want to pick up some Aquaphor if you are out shopping over the weekend - if the rash comes up quickly next week, it will help.
Although you should assume that you will be missing work for this adventure, there is some hope that it won't be a lot. Until the last week of treatment, my husband drove to work and then rads 4 days a week. He skipped all or most of work Fridays and did his chemo/rads, the last week of treatment, and most of the week following treatment. A good deal of how much you can do depends on your own reaction to treatment, how well you take care of yourself, and how flexible your work schedule is. Don't push yourself too hard!
Best wishes,
Maria