Hillary Clinton’s presidential campaign will undertake a fundraising blitz in the next five weeks, with more than 60 events planned through mid-September across 16 states and in Washington, D.C. The fundraising swing includes an event in the Netherlands hosted by a former U.S. ambassador.

The events will feature celebrities, such as Cher, Jennifer Garner, Jimmy Buffett and Barbra Streisand, as well as former President Bill Clinton and daughter Chelsea Clinton. Democratic Sens. Kirsten Gillibrand, Sherrod Brown and Bill Nelson...