Start with constraints, not lineups: which weekends can you actually do, how far will you really travel, and what is the all-in budget including the £150 you will spend inside the gates? That usually cuts 260 festivals to a dozen. Then — and only then — compare lineups, because a perfect lineup on a weekend you cannot make is a screenshot, not a plan.
The directory's filters map to exactly those constraints: month, region, size and vibe. The quiz does the same job conversationally if you would rather answer four questions than operate filters.
The South West owns the boutique-festival tradition; Wales has the scenery (Green Man's Brecon Beacons backdrop is the most photographed in British festivals); the North carries the big city weekenders plus Kendal Calling's Lake District perch; Scotland trades volume for setting and loyalty; and Northern Ireland's scene — Stendhal above all — is criminally under-travelled-to. London festivals are their own category: no camping, brilliant transport, and you sleep in your own bed, which after one muddy year sounds less like cheating and more like wisdom.
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Several hundred if you count music, arts, food, film, comedy and other cultural events. The camping music category alone is much deeper than most general roundups suggest.
The South has the heaviest concentration of large music weekends, but Scotland, Wales and the North of England all have strong and distinctive festival cultures.