Gabriel Gomez, the Republican candidate for the US Senate seat vacated by John Kerry, will address local business leaders Thursday at 8 a.m. at the Newton Health Care Center, 2101 Washington St. Hosted by the Newton-Needham Chamber of Commerce , Gomez will be focusing mainly on business-related topics, and then take questions from the audience. The 47-year-old private equity investor from Cohasset is making his first run for public office. He will face the Democratic Party’s nominee, US Representative Edward Markey of Malden, who spent the past 36 years in Congress, in the June 25 special election. Gomez is the son of Colombian immigrants and is a former Navy SEAL. The chamber has also invited Markey to appear at a similar forum; the date has not been announced. The hourlong event Thursday is free, but advance registration is requested. For more information, visit the chamber’s website, www.nnchamber.com.