I've done open lapping at HPR. It is much less structured than a CCA or similar event but they still divide into groups and do point by passing. There are the occasional more aggressive/stupid people out there that may try to pass in unexpected areas but they are easy to spot. It is a great opportunity to just get out and drive.
08 E90 | Jet Black / Black | 6MT
Mods: RAC RG63 w/ Pirelli Corsa 255F/285R | Akrapovic Evo Exhaust | OEM Blacklines
Winter Setup: OEM 18s w/ Nokian Hakkapeliita R 245/40-18