Large party rental stores have dance floors available for rent...........
The floors I'm familiar with are made from 3/4" hardwood plywood with 3 strips of hardwood sleepers attached to the bottom...........special countersunk flat-head bolts attach the plywood to the adjoining sleeper/plywood panel........
It would be expensive to make a one-time use floor from premium materials..........and lesser quality grade plywood would make a poor dance floor...........