Celebrated on June 30, Philippine-Spanish Friendship Day honors the significant relationship between the Philippines and Spain. This date commemorates General Emilio Aguinaldo's decree that the last Spanish soldiers, who had held out in Baler for nearly a year, be regarded as friends and given help to return to Spain.

Senator Edgardo Angara, who initiated this celebration, described June 30 as "a glorious day for both nations, with the siege of Baler producing heroes and victories for both." This historical episode represents the lasting friendship between the Philippines and Spain.