Well, there are several different ways to find your own rotation:
1) Look online and see if there are any hospitals that offer surgery rotation and then call them up and see whether they will take you (though online search usually works better for industry and government rotations than for hospital based ones)
2) Talk to your professors and see if they know someone who works in that role and might be willing to precept you
3) If both these ways fail, you can cold call all local hospitals' pharmacy departments and see if they would consider precepting you
In parallel, talk to your rotations coordinator to see what would be required of a preceptor both during and after your rotation. That way, if someone by chance does say that they would consider hosting you, you would be able to tell them how much or how little of a commitment it would have to be. That presents a much stronger case in your favor that stumbling, "Eh... uh... let me find out what my school requires." It can also sway the person's decision - if the preceptor has to go to your school once a week, for example, and a 20-page syllabus with fifteen signatures - that's too much for any normal person, but if all that's required is signing off one-page preceptor agreement and then giving you a grade at the end - that won't scare anyone off. Of course, reality is always somewhere between these two extremes.