Tickets are required to enter this event, however you can collect signatures outside before/after. It starts at 8am and ends at 5pm with lunch at 12pm so these would be the best times to collect signatures. If you are able to attend, please RSVP here and let us know if you need petitions or other materials.
Event info: https://www.facebook.com/events/185043402059577/
612 2nd Ave
Seattle, WA 98104
Google map and directions