There are two major things that you do not want to happen.
The worst case situation is your pool collapsing. We can get windy here in the NE, and without water in your pool it can blow the wall over.
The next worst thing is that your liner can dry out and become brittle, in which case you will need a new liner.
I would let the pool continue to drain via the leak, and if it stops you know where your leak is. As others have said, before it gets to low, go over the bottom. Pay careful attention to the seams. Look for any sort of rocks or objects under the liner (not easy in waders). You really just have to be methodical and go over the entire surface. Once you find your leak, patch it, and fill the pool at least a couple of feet.
The good news is we have some warm (relatively - 45 -50 F) temps coming through and an unsettled atmosphere Sun - Tuesday next week (meaning it may rain on and off) If you get it patched this weekend, you may just nature to help you fill it back up a bit.