From the Facebook event page:

Lanie was the unfortunate victim of a hit-and-run Sunday night on River Road. We would like to do a ride in her honor and raise some money for her family and partner and ease some of their burdens in their time of need.
The ride will begin at 9-9:30 pm next Sunday at the Oregon Hill lookout. Riders are asked to bring lights (the more the better) and we would prefer everyone wear helmets. The ride’s pace will not be fast, and all riders of all experience levels are encouraged to come. At our destination we would like to leave a ghost bike as well as flowers or anything anyone would like to add. I apologize for the event’s short notice. We are recommending a donation of 5 dollars or more, and of course all of the proceeds will be going to Lanie’s family and partner.