This is so crazy because I'm actually on here for the same reason, I'm presenting for my college's pride alliance! I included the same info that you said you have already, but I also made a slide with aro representation in media (mostly fictional, but still representation!) and some of my arospec headcanons for fun :)
I wanted to make my presentation engaging so I included some discussion questions at the end so we could have a causal talk instead of me just throwing facts at everyone for an hour haha. Here are some of my questions, and you're welcome to use them as well!
How are some ways that our society marginalizes people on the aro spectrum?
In what ways can we support our aromantic pals?
How can we deconstruct expectations for all people to experience romantic attraction?
What are some takeaways from this discussion?
