San Diego gets the biggest bump, perhaps because its parade is in July, while most others are in June, meaning San Diego Pride is less likely to compete with other cities for attendees. But Seattle also experienced a Pride effect of over 30%, even in June, with roughly 300,000 people coming out for last year's galactic love–themed parade.
Chicago, on the other hand, did not witness an increase in average ride activity during its Pride parade (digging into the data, Beyoncé's Renaissance World tour, which took place one month later and attracted lots of riders, can explain the relative dip).