How many people can Marriott Platinum Card take to the Executive Lounge?

One person. According to the query of Marriott Hotel official website, in JW Marriott Hotel, Marriott Hotel, Sheraton Hotel, Delta Hotel, Le Meridien Hotel, Westin Hotel, Convex Pavilion and Renaissance Hotel, a guest with a platinum card or above can bring another guest into the executive lounge. Marriott Platinum Card is a member of Marriott Group membership system. Generally speaking, as long as you stay at Marriott Hotel for 50 nights in a year, you can become a platinum member.