This evening at By Brooklyn, a Smith St. shop that stocks food and goods from local artisans, everyone with an interest in supporting indie business owners AND treating themselves to say, chocolate from Raaka or ceramic pendants by Perch–is invited to cash mob the store starting at 6:30pm. It’s essentially a group shopping spree, followed by drinks at Bar Great Harry, whose happy hour lasts till 8pm. Who knows who you’ll meet, or buy….