If you have more students than events, make them experts. They have to help those who have cards make sure they are in the right order. Points are easy to assign. If they are in the right spot, full credit. If they are wrong they can get half credit if they find the correct spot.
Experts get credit if they get things in the right order at the end.
Think about how you assess your students. I find that having students illustrate a point from the text is a great way to assess comprehension. If I truly just want to know what they understood, a picture is, indeed, worth a thousand words. I can assess the grammar, word usage, etc. Push for some of those higher order thinking skills.