I can’t find any announcements about extra runs to and from the San Juan Islands on July 3rd, but did just receive information about additional service on July 5th. Here it is:
To accommodate travelers on the busy Fourth of July weekend, WSF has added several extra sailings to its schedule on Tuesday, July 5:
6:45 p.m. Anacortes to Lopez Island
7:35 p.m. Lopez Island to Anacortes
10:10 p.m. Friday Harbor to Anacortes
10:30 p.m. Orcas Island to Anacortes
Space on these sailings (with the exception of the Lopez to Anacortes sailing) is now reservable atwww.takeaferry.com. Additional space will be made available two weeks prior to the sailings on June 21 and two days prior to sailings on July 3.