Common square dance audio generally support a wired microphone, a wireless microphone, a total of two; also support two wired microphone, two wireless microphone, a total of four. There are also some especially for musical instruments and some customized personalized audio, its 6.5MM interface will be more, can connect more wired microphone.
If you want to support more mics, you can buy a wireless microphone transmitter that links to the square dance audio, so you can set up more wireless mics to use.