Here's an idea (free for anyone to adopt!) for organizing biochar sanitation for a festival like Burning Man:
Charring Woman Biochar Camp
Purpose: To demonstrate ways that Burning Man (or any festival) can turn wood sculptures to biochar using top-lit burning methods and graywater to quench burns and save biochar. Biochar is then used to deodorize and sanitize human waste that can be taken home and used in gardens.