if you can't run speaker wires, how are you planning on powering the speakers? do you have access to a power circuit there?
There are wireless surround options that have a wireless transmitter/receiver combo + amp... somewhat problematic in that most usually use the 2.4 ghz band, which is often crowded and you might get some interference or unwanted pops, etc. - check rocketfish (best buy) or parts-express. there is a pro-level set up from Alto; the Alto Stealth.
good luck