Help at Beaver Lake Park this Saturday From 9 a.m. - 1p.m. this Saturday, March 27, volunteers are needed to help rid Beaver Lake Park of invasive plants. March 26, 2010 3:04 pm From 9 a.m. – 1p.m. this Saturday, March 27, volunteers are needed to help rid Beaver Lake Park of invasive plants. Volunteers will meet near the dog park. All welcome. For more information phone Dawn Sanders at 425-295-0556.