iOSDevUK started in 2011 as the UK's first conference for iPhone developers, and has attracted hundreds of developers to Aberystwyth each year since then. It runs from 4pm on Monday until 1pm on Thursday, followed by an optional Hack.  It is very much a community event, with a broad range of speakers, and contributions from attendees, rather than a few big names. The emphases of the conference are affordability, useful content, and community.