Geek and Sundry and Critical Role Charity 826 LA
My favorite group of nerdy-ass voice actors are knee deep in their charity drive for 826 LA, a non-profit dedicated to providing after school tutoring for kids in places where they wouldn't have it otherwise. They also have retail goods available for purchase so they don't just rely on donations to function.
Here is the link for the charity drive related to GeekandSundry and Critical role here:
https://www.crowdrise.com/o/en/campaign/critical-role-x-826la
For certain donation thresholds met certain discounts with D&D Beyond and other fun things related to nerdom can occur. See the link above for a full list of goals and rewards.