A gig in Vancouver was originally scheduled for this date, but was cancelled by city council. 

“Due to a freeze on rock concerts in Vancouver, Led Zeppelin announces that a second show will be held in the Seattle Coliseum, this Sunday at 8:00 p.m. This is a make-up for the City of Vancouver and all its Led Zeppelin fans. Tickets for the cancelled Vancouver show will be honoured at the Seattle Coliseum. So come on down and experience a killer of a show.”

Press Review excerpt:  Led Zeppelin Impressive in Seattle Stand

Led Zeppelin, Great Britain's premier hard rock blues group played to two near sellout crowds Sunday and Monday at the Seattle Center Coliseum. Both nights the audience got what it came for; high energy, hard-driving, absolutely wild rock and roll - the music to which the group owes much of its vast popularity in the U.S.

They are a superb stage band. Rock concerts have evolved into an entire style or theatrical performance, multidimensional involving aspects of dance and pantomime.

Some of the concert's most exciting moments were when Plant's voice and Page's guitar would dominate the music throwing the song back and forth, building to new heights or taking the number in an entirely new direction. The group's other members, John Paul Jones on Bass and organ and John Bonham on drums, were as accomplished as the rest of Led Zeppelin. There is a complex and highly individual style  to their music, long free-form instrumental breaks with loose phrasing and easy passage from one style and mood to another.

It's too bad that Led Zeppelin continues to be identified with such comparatively inferior bands as Alice Cooper and Black Sabbath. For underneath the group's heavy sound, there's a tremendous amount of musicianship and some of the most individual writing and composition occurring in rock today. [G. Arthur / Herald / June 1972]