February 29

This date only occurs in Leap Years.

45 BC The first Leap Day was recognized by proclamation of Julius Caesar. Under the old Roman calendar the last day of February was the last day of the year.

1288 Scotland makes it legal for a woman to propose marriage.  See 1912 item for Wyoming.

1912  The Wyoming Tribune published the names of eligible bachelors for the benefit of "matrimonially inclined women".  Things like this were surprisingly common at the time.  The publication on this date is not accidental, as this particular day was associated with "Sadie Hawkins" type events.  Attribution.  Wyoming State Historic Preservation Office.

1929  Grand Teton National Park established by Congress.  This entry seems somewhat inconsistent with an earlier entry made just a few days ago, so this might be the effective date of the establishment of the park, which was smaller at that time as compared to the current park.

1936  Uniformed superintendents of major National Parks served as pall bearors for John W. Meldrum, the first U.S. Commissioner for Yellowstone National Park, at his funeral in Denver.