The first full weekend of September brings an interesting mixture of events in and around Dallas. Choices include Harry Potter in concert, two local theater productions, an early Halloween event, three concerts, a unique dance/sound performance, a festival celebrating all things pickle, and two comedians. Below are the best ways to spend your free time this weekend. If you want more options, check out the calendar for an even longer list of the city's best events. Thursday, September 4 Dallas...