Saturday, October 27:  Annual Waimea Solar System Walk.  The Canada-France-Hawai`i Telescope and Keck Observatory are sponsoring the Waimea Solar System Walk, which turns Waimea into a scale model of our solar system, with the sun at Keck and Pluto/dwarf planets at CFHT. Prizes for the keiki, refreshments for all. Costume contest at 1 p.m. Event is free. To be held at Keck Observatory Headquarters, 65-1120 Mamalahoa Hwy., Waimea, to the Canada-France-Hawai`i Telescope offices, 65-1238 Mamalahoa Hwy., Waimea. 10 a.m. to…