Pi Practical Applications Exploration

I am seeking for a mathematical expert who can speak to a small community organization about the practical applications of Pi. The aim of this speech is to educate our group of 20-30 with information about Pi for 20 minutes. We cannot offer compensation, but you can promote your expertise after the talk and hand out business cards. Our idea is to delve into the utilization and importance of Pi in real world scenarios.

The ideal freelancer for this job is versed in the concept and applications of Pi.