>So when did the bohemian grove Change from the Buddha to the owl?
Not changed.
Originally created for the Bohemian Club's Cremation of Cares ceremony for their 1892 "Summer Jinx", this 70 ft. high lath and plaster statue of Buddha was modeled after the Daibutsu of Kamakura. It was constructed in the Bohemian Grove (known then as "Sequoia Valley"), and used in the club members' production of Buddha.
http://www.hiddenmysteries.org/conspiracy/research/bohemiantidbits.html