Page not fully loading

Hello, I have a calendar page on our website (which the slugs events / event), and the calendar works just fine, but when I click on each one of the events, already created, the page has nothing but the header and the footer. And I can see the full page with all the information on wordpress.
I use The Events Calendar and the events shortcodes and templates addon.
I apologize in advance since I am not a developer and I really could use some help to fix it…..
Events main URL: https://isasp.org.br/eventos-anteriores/
URL of one of the events that has nothing on it: https://isasp.org.br/evento/iv-encontro-tecnico-isa-sao-paulo-na-enel/
Thank you!

The page I need help with: [log in to see the link]