While you should go to the class, there is technically no need for a "surrogate." You can simply ask that we work on him. In larger classes we often don't do many remote people, as they are intended for the people in the class, but generally if we have time we will. Ideally, he will have asked for your help, is aware of the class/techniques and what time it is at, and is not busy doing other things during the class time.
There are also a number of therapists who offer distance healing over the telephone, and there is a series of conference calls that happen every week for people who are not near a class. You can ask about these options in the class.