Fix release_date for event cards
Fix release_date for event cards

dburr/SchoolIdolAPI,rdsathene/SchoolIdolAPI,SchoolIdolTomodachi/SchoolIdolAPI,SchoolIdolTomodachi/SchoolIdolAPI,SchoolIdolTomodachi/SchoolIdolAPI,dburr/SchoolIdolAPI,dburr/SchoolIdolAPI,laurenor/SchoolIdolAPI,laurenor/SchoolIdolAPI,rdsathene/SchoolIdolAPI,rdsathene/SchoolIdolAPI,laurenor/SchoolIdolAPI