This is a good way to think about it! I suspect most people get invited to talk and say yes (versus trying to find a venue) because that's what the venue model supports.

Learning how to give a better talk is just a proxy for: how can I better communicate my ideas to the audience so they remember them?

In 2 months no-one is going to remember any of the details about your talk but they'll remember the experience and if you have resources online, they'll seek those out.