Every Friday, Saturday and Monday in June, Lewis & Clark Caverns State Park will offer interpretive programs that cover the amazing plants, animals and geology outside of the cave. The park’s Friday Night Speaker Series takes place at the Campground Amphitheater and begins at 8 p.m. Most programs last about an hour. Speakers and dates are as follows: June 3: Dan Bachen: Wildlife Monitoring June 10: Stuart Parker: Geology of Caves June 17: Bill & Marti Cook: Bears June 24: Dianna Kellie: History of the Area