When was the sports center that hosted the first annual multi-sport event involving student-athletes from 18 regions of the Philippines outside Metro Manila built?
Pelaéz Sports Complex:  This sports center was built in 1969 and hosted the first Palarong Pambansa outside Metro Manila in 1975. Palarong Pambansa: The Palarong Pambansa (Filipino for "National Games") is an annual multi-sport event involving student-athletes from 18 regions of the Philippines.
1969