premise: Thai Prime Minister Thaksin Shinawatra and his Lao counterpart Bounnhang Vorachit Sunday jointly laid a founding stone to start construction of a controversial Nam Thuen II hydropower project, according to local media The Nation.
  The ceremony took place at the construction site of the powerhouse at Gnoumalat district of Laos's central Khammouane Province. Some 300 officials from both countries and international financiers and investors attended the event.
  During his weekly radio address on Saturday, Thaksin said that Thailand would buy electricity totaling 924 megawatts generated from this dam project annually upon its completion.
  He said that Thailand needs to depend more on hydropower and coal and less on natural gas in generating electricity, he said.
   What does "event" refer to?
hypothesis: Bounnhang Vorachit Sunday jointly laid a founding stone to start construction