I ate a good lunch! (I often do not... what a difference a little protein can make and man was I lucky I'd done it before they called that afternoon).
I had used my PPP vocal training method with my speaking voice all day. This way, I actually had exercised my voice instead of trashing it. Lucky!
I hydrated like crazy... used the H2O Overdrive product that I find very helpful.
I had a good suggestion offered to me by my brother Billy Devereaux, who said that I need to just know and believe that I could do it. Amazing how psychology can have a huge part in what we are capable of accomplishing... thanks, bro! (My husband seconded you).
I did a vocal warmup and before I left the house, I sang the song I'd chosen to know I could hit the highs. That helped immensely with the 'believing I could do it' part!
I was blessed with a fellow recording artist (Lyndsey Davis of "Summertown") who happens to be an expert in cosmetics and did my makeup and hair. With only a couple of hours to gather myself, choose songs and send pics and get tracks, I will never forget the kindness of some help... and she knew how to minimize bags under the eyes (ok it's a girl thing maybe?).
Any of you have experience with quick-readiness for unexpected gigs? Share!