Grito de Lares
Grito de Lares is held on September 23. Puerto Rico. This event in the third decade of the month September is annual. 
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Frustrated by the lack of political and economic freedom, and enraged by the continuing repression on the island, Puerto Rico's pro-independence movement staged an armed rebellion in 1868. Known as the Grito de Lares (the "Cry of Lares"), the rebellion broke out on September 23, 1868. It was planned by a group led by Dr. Ramón Emeterio Betances and Segundo Ruiz Belvis, who on January 6, 1868, founded the Comité Revolucionario de Puerto Rico (Revolutionary Committee of Puerto Rico) from their exile in the Dominican Republic.
Similar holidays and events, festivals and interesting facts
Commemoration of the Declaration of Martial Law on September 21 (the Philippines);
Holocaust Memorial Day in Lithuania on September 23
Mahidol Day in Thailand on September 24
The Fast of Gedalia in Israel on September 24 (Heb.: צוֹם גְּדַלְיָה - is a minor Jewish fast day from dawn until dusk to lament the assassination of the righteous governor of Judah. His murder ended Jewish autonomy following the destruction of the First Temple);
Remember Me Thursday on September 25 (Held on the fourth Thursday in September);
Orange Shirt Day in Canada on September 30
Pancasila Sanctity Day in Indonesia on October 1