Earth day is April 22 evey year. In 2025, this is a Tuesday and the park district has an event to celebrate Earth Day 2025. However, I have a CITO on the Saturday prior as we prep for Earth Day like activities and decided it would be nice to release this cache as part of that prep work. You are looking for a bison container. Please use stealth as this park can be pretty busy at times, especially in the summer.