These are local orienteering events, run from a variety of locations across the local area. They are an excellent way of trying out this sport for all the family but also give seasoned orienteers good competition or training.
For the latest event fixtures including the “urban” street O events click here
Details of events
Related info: The British Orienteering federation
And just in case you have no idea what this “Orienteering” is about here is a link to a page with all the answers! https://www.9round.com/articles/a-guide-to-orienteering