On Friday, June 19, San Luis Obispo's 30th annual "Concerts in the Plaza" kicked off downtown.Every Friday through Sept. 4, Mission Plaza will host free concerts for community members to enjoy.Concerts will begin at 5 p.m. and finish at approximately 8 p.m.R&B group The Groove Collective headlined opening night, alongside reggae artist Ras Danny.The weekly concert series, which started back in 1995, now draws over 3,200 people each Friday.Specia…