EcoCultureLab marked the 50th anniversary of the first Earth Day — a day when some 20 million Americans took to the streets, parks, and auditoriums in mass demonstrations and "teach-ins" on the environment — by working to organize a week-long public Teach-In of open classes, panels, exhibitions, and related activities. Then came the pandemic. In the end, we collaborated on a series of virtual events. See the blog entries from April 20-24, 2020, for details.