A Lincoln Day Dinner (sometimes called Lincoln Dinner) is an annual celebration of the Republican Party and a fundraising event for Republican Party affiliated organizations at the county level.
It will generally feature a notable person as a speaker.
Its counterpart for the Democratic Party is the annual Jefferson–Jackson Dinner.
The event is named after Abraham Lincoln, the first elected president of the Republican Party who helped found and shape the party, and is famous for having issued the Emancipation Proclamation which freed slaves held in rebellious Southern states.
In particular, this trend is common in the Southern United States.