Bethesda-based hospitality giant Marriott International Inc. on Friday announced the milestone opening of its 50th hotel in Thailand with the Madi Paidi Bangkok, Autograph Collection. Marriott expects to add a further 10 hotels by the end of 2024 across its luxury, premium, select and longer-stay brands. The company’s Ritz-Carlton brand is set to debut in Bangkok in 2024 with the opening of The Ritz-Carlton Bangkok, occupying the first 24 floors of a 50-story tower in the upcoming One Bangkok mixed-use development.