By Alex Weprin Senior Editor The Oscars are sold out. The Walt Disney Co. says that this Sunday’s broadcast of the 98th Academy Awards has officially sold out of advertising inventory, marking a major milestone in the company’s live event programming push. Sponsors relevant to the media business include the streaming service Peacock, Disney Cruise Line and Microsoft, with other sponsors including Starbucks, Rolex and first-time advertiser Burger King. Advertising rates are said to have grown by double digits compared to last year, with the company also adding some 24 new sponsors, alongside 18 returning sponsors. The Oscars are the most-watched primetime entertainment program in the country (the only programming that tends to be it is football, major political news or the Macy’s Thanksgiving Day Parade), making it a prized opportunity for big brands.…