Due to the way Next.js remote Patterns work to protect app for malicious users. I've included these image urls examples. Copy and paste in the 'Event Image' field:

https://upload.wikimedia.org/wikipedia/commons/thumb/5/53/Colosseum_in_Rome%2C_Italy_-_April_2007.jpg/640px-Colosseum_in_Rome%2C_Italy_-_April_2007.jpg

https://upload.wikimedia.org/wikipedia/commons/thumb/b/bb/Teatro_de_M%C3%A9rida%2C_Espa%C3%B1a%2C_2017_18.jpg/640px-Teatro_de_M%C3%A9rida%2C_Espa%C3%B1a%2C_2017_18.jpg