The EAA campgrounds in Oshkosh officially opened June 26 weeks before the air show's mid-July start and campers are already arriving in force.The campgrounds host around 40,000 campers across 15,000 sites each year, making it roughly the size of a small city. For many of those campers, the draw isn't just the aircraft on display it's the community they've built over years and even decades of returning.Wally Soplata has been coming to EAA since 2…