All I can tell you is that there are stadiums--and all are much smaller than the Olympic Stadium--in every town that has held the National Games: La Vega, Mao, Barahona, Monte Plata, La Romana, San Francisco de Macoris. Santiago, the site of the XV Central American and Caribbean Games (1986) has the largest of the other stadiums.
There are probably some pictures in the newspaper archives.
HB