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Osceola's birthday arithmetic is set by two banked dates that pull in opposite directions. The town was platted on paper in 1837 — the plat signed by John A. Henricks, the town's own history page dating the christening to November 17, 1837 — and that plat was vacated on January 31, 1842; the standing town rests on the paper of 1856 and 1859. The town was not incorporated in law until 1993, the annexation ordinance of May 3, 1993 standing in a record that still shows it unincorporated in 1907 and 1917. A centennial on the plat's line therefore fell in 1937, and a sesquicentennial in 1987; a centennial on the incorporation line does not fall until 2093 and cannot have been celebrated. Both reachable birthdays were tested — in the record, in the town's published history, and in open-web searches run for “Osceola” Indiana centennial, 1937 and 1987 — and the record does not show either one. No centennial celebration, no sesquicentennial, and no birthday observance of any round year is printed for this town in any source reached. That absence is itself the article the checklist asks for: the birthdays the record does not show, printed as not-shown. The likeliest reading is structural, and it is printed as reading, not fact: a village that was not yet a legal town in 1937 or 1987 — governed from the township, schooled from a corporation seated elsewhere — had no municipal self to throw itself a birthday, and the one celebration habit it demonstrably formed, the summer music festival, dates only from 1984. The settler for any contrary claim is the same as the gatherings': Kiracofe (1988), ISL 977.201 S143zok, with the Tribune files for 1937 and 1987.
Sources: This build's Famous Stories & the Record (“Osceola was founded in 1837” — plat signed, vacated 1842, standing town on 1856/1859 paper) and Government (unincorporated in 1907 and 1917; incorporated by May 3, 1993). Town of Osceola history page — plat christened November 17, 1837. Open-web centennial searches, November 2026 — no 1937 or 1987 observance returned for this town.