The Seattle Ghost Marathon is a 501c3 Non Profit that puts on a private donation only club run. Events include 13.1 half, 26.2 full and 50K options.
This is a private club run starting from a tiny park (Ferdinand St boat launch in Google Maps) about 0.5 miles north of Seward Park in Seattle. Parking is limited to volunteers and finish area recovery so park off S Ferdinand St. in the nearby neighborhoods.