On April 20, 1790, former Maryland Governor Thomas Johnson, of Frederick, was appointed to a seat on the General Court of Maryland.
On April 20, 1821, an African lion, a buffalo, an elk and a calf with six legs were exhibited at Shimmells’ Tavern in Frederick.
On April 20, 1828, the Carroll Creek through downtown Frederick flooded.
On April 20, 1840, a Whig Party convention was held in Frederick.
On April 20, 1890, the Reformed Church in Middletown was reopened and rededicated after extensive renovations.
On April 20, 1921, William Jennings Bryan, a former presidential candidate, spoke at The City Opera House on North Market Street in Frederick, under the auspices of the Frederick County Christian Endeavor Union. This building now houses Brewer’s Alley.
On April 20, 1936, the trustees of the C. Burr Artz Library decided to demolish the old Frederick Academy at Council and Record streets in Frederick and to build a new facility.
On April 20, 1941, Katherine Edgar Byron, widow of Congressman William D. Byron who was killed earlier in the year in an Atlanta plane crash, was nominated to succeed her husband in the House of Representatives.