If you haven't heard, K-pop sensation BTS is having a free concert in Central Park this week -- and a monster two days of shows at MetLife Stadium this weekend. And the NYPD doesn't want you pitching a tent to hold your spot for days. The South Korean boy band, made up of members RM, Jin, SUGA, j-hope, Jimin, V and Jung Kook, will perform free in the park as part of the annual "Good Morning America" concert series. Fans are already in line -- and if the queue to watch BTS on "Saturday Night Live" last month (when they became the first ever Korean pop group to do so) is any indication, many more will join. Given the crowd expectations, the NYPD tweeted a reminder Friday, well in advance of the show, that "For your safety, camping in the concrete jungle is not permitted." And if you're planning on heading to the Meadowlands, be prepared to wait as you come home: NJ Transit says waits after the concert could top two hours! Today in New York's Lauren Scala also reports on an NYPD ...