1839 Whig National Convention

The 1839 Whig National Convention was a presidential nominating convention held from December 4 to December 8 in Harrisburg, Pennsylvania. It was the first national convention ever held by the Whig Party, and was organized to select the party's nominee in the 1840 presidential election.

Source: Wikipedia — 1839 Whig National Convention (CC BY-SA 4.0)