After nearly 19 months of industry uncertainty, the DJ market returned in a big way as DJ Expo 2021 brought jocks of all stripes back into its community. Rebranded as DJX, the DJ Life-produced trade-show/exhibition filled the Hard Rock Hotel & Casino Atlantic City this past Aug. 9-12 with mobile entertainers, club DJs, streaming jocks and home-studio hounds. After missing its 2020 incarnation due to the pandemic, the show on AC’s famed Boardwalk delivered three days of exhibits featuring some of the industry’s latest technologies, four days of seminars, workshops and keynotes, and three nights of sponsored After Dark events.…