I had the opportunity this week to present a fun little poster at SIGCSE.

We took data structures students on a field trip to the library to help them better understand how the library functions as a data structure, and the algorithms that librarians use to maintain it. The activity worked great!

The really fun part of this poster for me, at least, is that I could explain it to anyone in a sentence. Every conference talk/poster I've done in the past has been complex and niche, so only a dozen people are even interested, and it takes a few minutes to explain even to those people.
If you ever wonder if your research idea is too simple or obvious to get published, submit it anyway. Worst case they reject it. Best case, everyone who walks by your poster instantly understands what you were doing and why.