This was a talk that I gave to about 160 parents of kids preparing for First Holy Communion. Our parish has a three hour retreat where they do a mix of kids-only, parents-only, and kids/parents together. I talked to the parents for 35 minutes about the Eucharist.
You can tell that this talk is not catechesis, per se, but more Kerygmatic proclamation. I use the Eucharist to focus on a basic proclamamtion of the gospel.
It's short and punchy.