What you're asking is not possible so buy yourself a dog, they are much better than cats.
Ok now the serious answer, If you have a microphone and people are talking near it the mic will pick them up, that is the nature of things. The relative volume of the talking and the music is important. You can reduce the affect of wind noise with a correctly fitted wind shield or for a light wind, a dead cat might do. If you understand that a wind shield is slowing down the speed of the air movement with the fur and that the microphone is very very sensitive to changes in air pressure, this is the best you can hope, just to reduce the affect of it and not get rid of it completely. The only way to get rid of it completely is to put it in an air tight sealed box but then you would not get any sound.
I can't recommend the Røde Stereo VideoMic as I've never used one. I use a Zoom H4n for this type of recording, it has an adjustable stereo pick up field of 90 or 120 degrees and works very well so long as it is near enough to the stage. (like all mics need to be)