Galleries, auctions houses and museums join forces this week for the 12th annual Asian Art in London (Oct. 29-Nov. 7) which will include special shows at some 40 galleries, dealing in the ancient and the contemporary, with works from China, Japan, Korea, India and the Himalayas. Christie's, Sotheby's and Bonhams will hold major auctions. On Nov. 5, Bloomsbury Auctions will devote its entire sale to Mao's revolution, including a 1968 vase estimated at £10,000-£15,000. Lectures and special events will take place at museums and other institutions.