Python Ireland will be running a sprint on the open source Python Ireland website, see https://github.com/PythonIreland/website for details. The Python Ireland webmasters will be available to help people wishing to contribute.
DjangoGirls will also be running a workshop, please see https://djangogirls.org/dublin/ for details.
There's a quiet sprint room available for working on your projects. Feel free to mention what you'll be working on below in the comments.