A charity event that purported to support veterans, first responders and rescue dogs is scrambling to prove it’s not a “thinly disguised” rally for former President Donald Trump, according to a new report. The Palm Beach Post published Friday an extensive report on the Mar-a-Lago Hero Gala that has boasted access to key team Trump player Alina Habba, pro-Trump celebrities such as Jon Voight and a fan group that calls itself the “Trumpettes.” “It sounds like a Republican fundraising event,” one Palm Beach resident told the Post, “knowing who these people are.” The World Series of Golf Foundatio…