In light of some heavy things that are happening in the world right now, the international holiday of World Kindness Day observed on November 13 couldn’t have come at a better time.

Introduced in 1998 by the World Kindness Movement, the day encourages people to overlook differences in race, religion, socioeconomic status, and the like and instead engage in acts of kindness towards those who are different from you.

#WorldKindnessDay trended all day Sunday on Twitter. Celebrities joined in on this trend, and posted about what they did to celebrate the holiday.

Ellen DeGeneres tweeted out a video highlighting acts of kindness done on her talk show and urged her fans to do something nice for others. Anthony Hopkins expressed, “Be kind, everyone is fighting a great big battle. #WorldKindnessDay.” He later tweeted another message, “On #WorldKindnessDay, let us remember, we need less bullying and more kindness,” along with a video for PACER’s National Bullying Prevention Center. La Toya Jackson felt, “Be the reason someone else #smiles this #SundayMorning! #WorldKindnessDay”

Throughout the United States, groups came together to bring awareness about the holiday. One of the most popular ways to come together was through flash mobs. “Dance for Kindness” took over many cities, including Ayer, MA, San Francisco, CA, and Lakeland Florida. Over 12,000 people participated in the dance in 2015. Cities from across the nation pick a place to perform a flash dance mob in order to spread the beautiful message.

Small acts of kindness haven’t gone unnoticed this day, either. A Nottingham City bus driver was thanked after he woke up a sleeping passenger on his bus. Another group of strangers were praised for their kindness after helping to rescue a missing dog.

What will you do to spread kindness?