It should be fine. I did this in December. Ran on the Tuesday in my new racing flats, ended up with a strain in my left calf. Spent the rest of the week googling and posting obsessively about my calf, it was really stressful. I would say RICE, don't bother running. I did a light 2km run on the Friday just to check functionality i.e could I run 2km without pain. I ended up using 2 compression socks on one calf, felt uncomfortable to run in, but no pain and calf posed no problems. I didn't end up running in my racing flats - Hyperspeeds and went back to my more cushioned Asics Noosas. So don't stress, perhaps consider a compression sock, they seem to really help me with minor strains.
That's encouraging. It feels tight right now but no pain when I walk. As Mattr suggested, I plan on using KT Tape the day of the race and will also be putting on a compression sock in T2. Holding my breath until then. It should be obvious in the first few kms whether its going to be a problem.
Fishbum - I've had tightness before and some brief mild pain that would eventually go away during a run, but on Tuesday it was elevating quickly so I'm pretty sure its a strain. Some conflicting opinions on foam rolling and I read an article not to use the foam roller until its had a chance to heal.
NAB777 - I'm trying to schedule an appointment with my physio and waiting to hear if there are any cancellations before the weekend. Holding off on hard massage and A.R.T. until my physio takes a look at it.