I managed to start my 345-stitch cast on for the Peacock Shawlette (I'm doing a larger version) on Friday afternoon (the official Ravellenic start day), and even spent some of Friday night casting on as well.
My Saturday knitting plans were thwarted by my mother and the art museum in town, but Sunday I somehow managed to finish my cast on and start knitting.
Alas, things did not start well, because when I picked it up again the other day and purled back, something seemed weird, even though my stitch count was right. Knitting across again, I had an extra stitch. I brought it into work for Sam to look at, and she noticed weirdness right away and suggested I "read my knitting" back and figure out where/if there were other mistakes. I tried, only to realize that something had likely happened on either the first row, OR the purl row, and I was going to have to rip it all back and start again.
So I'm in the middle of casting on again right now. Likelihood I'll finish by the end of the Olympics? SLIM.