This year the web site (http://eppersongallery.com/) says it is an invitational. You might have to send some images to the Epperson Gallery. firstname.lastname@example.org
The web site says that entries including the fee of $40 is due by July 2nd. I would recommend entering, last year was good, each artist got to display 3 works at the gallery and there was wine and snacks for the reception which is August 2nd this year. Most of the work was in oil but also several watercolors. Last year the guest juror was the editor of a plein air journal.