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Dave Portnoy is running it back with his popular One Bite Pizza Festival ... and the Barstool Sports founder tells TMZ Sports there's one guy he'd roll out the red carpet for at this year's event -- Charles Barkley.
We chopped it up with El Pres about the "greatest gathering of pizzerias" going down September 13 at Randall's Island Park in NYC ... and he raved about the lineup of eateries involved in the fun -- including Ceres, which he gave a rare >9 grade in one of his recent reviews.