How do you get 2 iPads to discover each other

Are you trying to use the mobile hotspot on one to connect the other?

For what purpose? What exactly are you trying to accomplish?

AJ397 guessed you are trying to use mobile hotspot. I am guessing you are trying to AirDrop.

Note you cannot pair an iPad to another Apple device (e.g., another iPad, iPhone, Mac).

Share content with AirDrop from your iPhone, iPad, or iPod touch - Apple Support