Pennsylvania is not usually considered wine country, but that image may undergo some revision next weekend at the Colonial York International Wine, Cheese and Beer Festival. Then again, it may not. In any case, the event is a fund-raiser for the Lincoln Engine Co. No. 9 and a chance to compare not only Pennsylvania wines, but also New York, California, and imported wines described as nothing fancy, but "for the average person." Besides selling trays of four different glasses of wine with four kinds of cheese ($4 or $5 for the lot), the festival will sell knockwurst with Pennsylvania Dutch-style fixings (sauerkraut, potato salad and red cabbage) and Italian steak sandwiches, pitchers of beer, wine by the glass or bottle, and eight kinds of cheese by the pound. All that goes to the sound of continuous free entertainment - Dixieland and German bands, Alpine dancers and, in a quiet corner of the festival, lectures on wine-tasting and wine-making. To really appreciate all this you must realize that Pennsylvania is one of those states where you usually can buy wine only in state stores.

Colonial York International Wine, Cheese and Beer Festival. York Interstate Fairgrounds, York, Pa. August 18 and 19, noon to 10 p.m.; August 20, 10 a.m. to 10 p.m. $1.50 admission.