If you are a fan of fantasy and science fiction books, chances are that you have come across the novels of Patrick Rothfuss. They're wonderful.
Worldbuilders charity fundraising efforts. Worldbuilders exists to raise money for charities that make the world a better place - primarily Heifer International, which helps families in poor communities by providing them with training and resources like bee hives, goats, chickens, cows, so that they can build up a regular income and a small business.
But Worldbuilders doesn't just ask for money. Worldbuilders offers fantastic goodies, which you can buy, bid on in auctions, or win through a massive raffle. There are literally thousands of books, games, paraphernalia, services for writers and other geeky bits of joy. So if you want something in return for doing good, you can either enter the lottery to win things, or buy stuff outright.
Have a look at Pat's blog posts about Worldbuilders. He's a nice guy who is running himself ragged trying to bring goodness to the world, and his achievements are phenomenal (even if he is wracked by anxiety about his efforts). Or read the summary on the Worldbuilders blog - it's the tenth anniversary of Worldbuilders this year.
This year, Worldbuilders runs from November 27, 2018 through December 11, 2018, and I decided to promote it here on my blog.