On Wednesday, August 4th, 1858
Lincoln is in town for several hours. During evening he talks politics with John M. Palmer.Carlinville Free Democrat, 5 August 1858; Abraham Lincoln to John M. Palmer, 5 August 1858, CW, 2:536.

Related sources from The Abraham Lincoln Papers at the Library of Congress

Hiram M. Tremble to Abraham Lincoln, Wednesday, August 04, 1858 (Senate)

William P. Kellogg to Abraham Lincoln, Wednesday, August 04, 1858 (Senate)

Paris Illinois Republican Central Committee to Abraham Lincoln, Wednesday, August 04, 1858 (Invitation)

Joseph O. Glover to Abraham Lincoln, Wednesday, August 04, 1858 (Senate)

Joseph T. Eccles to Abraham Lincoln, Wednesday, August 04, 1858 (Senate)

C. W. Waite to Abraham Lincoln, Wednesday, August 04, 1858 (Senate)

Owen Lovejoy to Abraham Lincoln, Wednesday, August 04, 1858 (Senate)

Lincoln Timemap for 1858