**The following post is from [Jonathan Gray](http://jonathangray.org/), Community Coordinator at the [Open Knowledge Foundation](http://okfn.org/).**
This weekend developers all over the world will get together for [a series of events](http://www.rhok.org/events) as part of [Random Hacks of Kindness](http://www.rhok.org/), which aim to use “**practical open technology to make the world a better place**”. We imagine that many of the things that people will work on will build on **open datasets from public bodies**.
As Random Hacks of Kindness finishes on the evening of the 5th June, we thought we’d remind people that the [Open Data Challenge](http://opendatachallenge.org/) also finishes on **midnight on the 5th June** (i.e. between 5th and 6th June). There are **€20k worth of prizes for apps, ideas, datasets and visualisations**. Any #RHoK developers based in Europe are eligible to enter!
If you’re not a developer, or don’t have time to build anything – you might nevertheless be interested in [submitting an idea](http://opendatachallenge.org/#enter) to the competition.
Also if you’re looking for open data to use as part of RHoK, you might be interested in having a look on [OpenDataSearch.org](http://opendatasearch.org/), [PublicData.eu](http://publicdata.eu/) and on [CKAN](http://ckan.net/). If you get or clean up any datasets and want to share them – please do consider [adding them on CKAN](http://ckan.net/package/new) so others can find and build on your efforts!