June 1

June 1, 1846: The first press dispatch by telegraph arrives in Rochester at the New York, Albany, and Buffalo Company office, reporting on the constitutional convention in Albany. In 1860, this company was mergered with the Western Union company, then headquartered in Rochester.
Sources and Further Reading:

1. History of Rochester and Monroe county, New York (1908), William F. Peck, pg 76

September 22

September 22, 1936: Three thousand Rochesterians as well as hundreds of dignitaries from industry, local government, banks, clergy and the press crowd into Sibley's downtown department store as Mayor Stanton unveils the city's first Escalator. At the cost of $250,000, the moving stairway was hailed as a "feat of construction and engineering" and a significant investment in the future of the city.

Source: Marcotte, Bob, "Sibley's had humble beginnings",Rochester Democrat and Chronicle.com, June 15, 2009