The strongest arts programming in British festivals is not at arts festivals — it is woven into the multi-genre weekenders. WOMAD remains the great global-culture gathering, programming workshops and world-class musicians you will not hear on radio anywhere else. Latitude's theatre, poetry and literature tents run at near-Edinburgh quality. Shambala and Green Man both fold science talks, craft workshops and genuinely odd art into every corner of their sites.
Literature, science and craft programming reward the same advice everywhere: check the timetable before you go. Music repeats; the one talk you wanted does not.
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Anything centred on artistic or cultural programming rather than music as the main draw: theatre, literature, film, ideas, comedy, performance and multi-discipline cultural gatherings.
No. Edinburgh, Hay-on-Wye and many regional cities host some of the most distinctive arts events in the UK.