• Sponsored by Prepared 4 Life, Lemonade Day is a citywide event aimed at teaching Houston’s youth how to start, own and operate their very own lemonade business while building on P4L’s mission of instilling life skills, character education and entrepreneurship. HISD students have been participating since 2007. This year, Lemonade Day will take place on Sunday, May 3, 2015. Participating students will receive Lemonade Day educational materials to help the students understand the steps involved in operating a successful.