Don't stay home because you don't have a 2-way radio. They help, and you miss out on some funny conversation without them but there's usually a couple extra to be loaned out and even if you don't have one we'll disperse the people who have been on the run before to keep the group together. There'll be a lead car and a tail car and we stop or slow down everytime the group gets split up by traffic lights or something.
The point is you're NOT screwed if you don't have a radio, come on out anyways. It's a good time and you get to put faces to the names and see some nice cars.
PS: If you're unsure, the 2 way radios in question are handheld FRS style radios. You can find them in most any electronics section (ie Future Shop, London Drugs, Best Buy). Note that the cheapest ones have channel 1, 2, 3, etc, while the slightly more expensive ones have subchannels (ie, 1 sub 0, 1 sub 1, 1 sub 2) giving you far more options for finding a clean channel. If you want to pick some up expect to pay about $100 for a pair of rechargable ones with subchannels.
PPS: If I had to give a couple pointers to first-timers; Show up with a full tank of gas, it's just easier we don't have to wait around for 30 cars to fuel up when we stop. Make sure you car is clean, most guys show up with spotlessly clean cars, you don't want to be the guy with the dirty car
Most importantly, don't drive like a douche. There's far too many of us to be driving like a retard, passing dangerously, swerving around etc. We don't need to draw that kind of attention from the law and we don't need to find out what happens when one member is showing off and driving like an idiot and wrecks a couple other member's cars. You'll command far more respect by driving safely with the group than you will by showing off your L33t MaD cRaZy driving skillz. Oh, and don't be afraid to say hi and introduce yourself.