(Japan) Engineer's Day (India) Independence Day, celebrates the Act of Independence of Central America from Spain in 1821 of Guatemala (a Patriotic Day), El Salvador, Honduras, Nicaragua, and Costa Rica. International Day of Democracy Knowledge Day (Azerbaijan) Restoration of Primorska to the Motherland Day (Slovenia) Silpa Bhirasri Day (Thailand). The beginning of German American Heritage Month, celebrated until October 15 The beginning of National Hispanic Heritage Month, celebrated until October 15 (United States) World Lymphoma Awareness Day (International) References External links Days of the year September