I think you can just take it out, let it get to room temperature, and pitch it tomorrow. If the wort is clear on top of the yeast slurry then you can pour off some of that, but it's probably still cloudy.
I did the worst recently. I activated a Wyeast pack over a month ago, realized that I was not going to get to brew, put it in the fridge, 2 weeks ago I took it out and once again realized I was not going to be able to brew so I put it back in the fridge then on Saturday I took it out and brewed on Monday night. My beer is happily fermenting away. I am not advising this method, but I think if you aerate properly and your beer is not too big you should be fine.