Open carry as individuals in daily life is what advances our cause - normalization of gun carry - best.
Carrying in a group has two drawbacks - first, less likley to normalize gun carry, and two, more likley to frankly "justify" as a legal and publicity manner a police response, e.g., unfairly but often inevitably charachterized as "a mob of people with guns." Carrying in groups actually signals you are afraid to carry and deters iothers from doing so.
That's not to say nobody should hold open carry meetups, rallies, luncheons, etc. - I'm just pointing out the range of courses of action and likley outcomes.
I hae open carried in VA, PA, OH, WV, and KY in various public places and often in front of police officers - never had a problem with any police officers, though some officers did check me and some others while eating dinner at Chammps in Reston in 2004 one time.
I suggst folks stop worrying about the police so much - in the nlikley event you are detained unlawfully, then see an attorney and makes some official complaints - that's the way to deal with unlawful police behavior - carrying in groups with cameras to try to incite a police response so you can record it is not very productive.