It takes place on the same weekend as T in the Park in Scotland and shares a very similar line-up each year , although Oxegen is generally regarded as Ireland 's version of the world-renowned Glastonbury Festival , with the 2008 festival sharing three of the same headliners . It takes place on the same weekend as T in the Park in Scotland and shares a very similar line-up each year , although Oxegen is generally regarded as Ireland 's version of the Glastonbury Festival , with the 2008 festival sharing three of the same headliners as its English counterpart .