Has anyone tried using Mentimeter at a wedding?

My friends are getting married in two weeks, and I have been asked to host the wedding. I want to create a quiz about the newlyweds to entertain the guests.

I looked up different quiz platforms online, and it seems like there are no free options for 200+guests and about 20 questions. However, according to Mentimeter's website, users can exceed the 50-participant limit once a month for free.

There is no way I can test this statement before the wedding (because obviously, I do not have 50+ devices), so I would be grateful if anyone with similar experiences could share their opinions.