https://www.theregister.co.uk/2017/08/23/send_eclipse_glasses_to_south_america/

On Monday, millions of Americans watched nature's ballet play out across the Sun (excluding those of us in San Francisco, where we were fogged in). Now an appeal is going out for used glasses to be donated to charity.

Astronomers Without Borders is asking people who bought proper (not rip-off) eclipse viewers to send them in so that they can be shipped off to schools in Chile and Argentina. A total eclipse will move over the two countries on July 2, 2019 and the astronomy organization wants kids in the southern hemisphere to have a safe viewing experience too.