Estonians definitely know how to pull a crowd together. It's simply part of the Estonian mindset to do so when they see a problem.
This is easy to see in the Song and Dance celebration that has been held since the 19th century and is regarded as one of the most powerful movements in modern Estonian history. World Cleanup Day, a strong contender, was first held on 15 September 2018, starting at 10 am in New Zealand, and ended 36 hours later in Hawaii. During these daylight hours, millions of tons of illegal trash were removed from nature all over the world. Overall, this included more than 18 million people from 157 different countries.