On Saturday, tens of thousands of runners are expected to descend upon Seattle Center for the fourth annual Rock ‘n’ Roll Marathon. Every mile of the revamped course, which highlights the city’s notable landmarks, will be marked by mini-concerts. The day will end with a free post-race festival and concert featuring Gym Class Heroes. All proceeds will go to the American Cancer Society.

Will you be Rock ‘n’ Roll running this weekend? Share your Instagram photos by tagging them with the hashtag #RnRSEA. If you want to share a photo you have already uploaded to Instagram, just leave the hashtag in a comment on the photo.