My daughter is graduating school then starting a northbound flip flop around June 6. She wants to be hiking with people, so she doesn't want to start too far behind the folks who are thru hiking north from Georgia. If she starts at Harpers Ferry, will most of those people have already passed through, leaving her to hike with few others? or will there be plenty of thru hikers still passing through Harpers Ferry at that time heading north? And if the former, where should she start instead? Thanks!