Jimmy Donaldson, aka MrBeast, and Jeff Housenbold are making their pitch to advertisers on May 12. Craig Barritt/Getty Images for TIME YouTuber MrBeast is wooing Madison Avenue at a swanky invite-only event. MrBeast and his company's CEO want to pitch bigger ad deals to top brand and agency execs. It shows how hard creator-led media companies are competing with legacy media giants for budgets. YouTube star MrBeast is stepping up his charm offensive with Madison Avenue as his company ramps up efforts to win a larger share of traditional TV ad dollars. Beast Industries is hosting a breakfast for top brand and ad executives and creator-economy insiders at Penthouse 45, a sleek Manhattan event venue known for sweeping views of the Hudson River and New York City skyline. The invite-only gathering will feature Jimmy Donaldson (aka MrBeast) and Beast Industries CEO Jeffrey Housenbold talking up the company's assets, growth plans, and media partnership goals, three people who saw the invite said.…