Have you noticed the numerous contests offered by social sector causes? Many are being generated from social media platforms or via organizational websites.
A very quick web search delivered the following contests:
Contests are relatively easy to run at a low cost. They can drives traffic to your website or social media platform, provide contribution from your fans and general public, engage community, and amplify your cause.
The Case Foundation has a great tutorial on how to run a video contest for your nonprofit.
What-if-concepts 