Black text on an outer white edge and a color illustration of the Golden Gate Bridge in the center
The Golden Gate Bridge in San Francisco, California celebrated its 50th anniversary on May 28, 1987. Part of the festivities featured "Bridgewalk '87," meant to reenact "Pedestrian Day '37," which took place the day the bridge was deemed open for use. Due to the weight of the estimated 300,000 people who made it onto the bridge, the normally convex shape was temporarily flattened. Further celebrations included a vintage car parade, a concert, and a fireworks display.
Source: Golden Gate Bridge, Highway and Transportation District. (2017). Golden Gate Bridge anniversaries. http://goldengatebridge.org/research/anniversaries.php