Visit of the Leshan Giant Buddha on Sunday (26.05)

Hi,

I like to visit the Leshan Giant Buddah on Sunday the 26.05 and want to ask, if the Chengdu Sightseeing Bus "Leshan Giant Buddha Round Line" is driving on this day? Is it right, that the bus leaves at Chunxi Rd (Exit C of Chunxi Rd. Metro Station) at 8:30 and drives back from the Leshan Giant Buddah at 16:30? And is there any possibility to reserve a seat or is it first come, first serve?