‘250//The Concert,’ ViewerCon, Judy Collins and Richard Thompson, more

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Here is a roundup of major arts events taking place around New Jersey, through July 23.

MUSIC

• “This show could be the only Disciples gig, maybe, ever again,” says Stevie Van Zandt about his appearance with his band The Disciples of Soul at ParkStage in Freehold. The 5 p.m. July 17 show, titled “250//The Concert” and postponed from July…