It's surely down to festivals, in the UK at least? A quick non-exhaustive look at August, in England only, gives:


Wickham Festival - 3rd Aug 2017 - Wickham, PO17 5HD, Hampshire

Wilderness Festival - 3rd Aug 2017 - Cornbury Park, Oxfordshire

Americana Folk & Roots - 4th Aug 2017 - Richmond DL11 6ED, Yorkshire

Sidmouth Folk Week - 4th Aug 2017 - Sidmouth, Devon

Sidmouth Fringe Sessions - 5th Aug 2017 - Salcombe Regis, Devon

Surrey Mini Bluegrass Festival - 5th Aug 2017 - Mickleham, RH5 6EE, Surrey

Boomtown Behind the Mask - 10th Aug 2017 - Matterley Estate, Winchester, SO21 1HW, Hampshire

Fairport's Cropredy Convention - 10th Aug 2017 - Cropredy, Oxfordshire

Billingham International Folklore Festival of World Dance - 11th Aug 2017 - Billingham, Cleveland

Bridport Folk Festival - 11th Aug 2017 - Bridport, Dorset

Broadstairs Folk Week - 11th Aug 2017 - Broadstairs, Kent

Dartmoor Folk Festival - 11th Aug 2017 - South Zeal near Okehampton, Devon

Lake District Folk Weekend - 11th Aug 2017 - Staveley, Cumbria

Saltburn Festival - 11th Aug 2017 - Saltburn, Yorkshire

Bath Folk Festival - 12th Aug 2017 - Bath, Somerset

Folk At The Fort - 12th Aug 2017 - Newhaven, BN9 9DS, Sussex

Radford Mill Blues Festival - 12th Aug 2017 - Radford, BA2 0QF, Somerset

Beautiful Days - 18th Aug 2017 - Escot Park, Devon

FolkEast - 18th Aug 2017 - Glemham Hall Grounds,, Suffolk

Just So Festival - 18th Aug 2017 - Rode Hall, Cheshire

Moira Furnace Folk Festival - 18th Aug 2017 - Moira, Swadlicote, DE12 6AT, Leicestershire

White Horse Folk Festival - 18th Aug 2017 - Grove, Oxfordshire

Whitby Folk Week - 19th Aug 2017 - Whitby, Yorkshire

Purbeck Valley Folk Festival - 24th Aug 2017 - Purbeck Valley Farm, Swanage, Dorset

Shambala Festival - 24th Aug 2017 - Secret, Northamptonshire

Cornwall Folk Festival - 25th Aug 2017 - Wadebridge, Cornwall

Cottingham Folk Festival - 25th Aug 2017 - Cottingham, Yorkshire

Greenbelt - 25th Aug 2017 - Boughton Estate, Kettering,NN14 1BJ, Northamptonshire

Maui Waui Festival - 25th Aug 2017 - Theberton, Suffolk

Shrewsbury Folk Festival - 25th Aug 2017 - Shrewsbury, Shropshire

Solfest - 25th Aug 2017 - Tarns Nr Aspatria, CA7 4NG, Cumbria

Stroud Fringe - 25th Aug 2017 - Stroud, Gloucestershire

Towersey Festival - 25th Aug 2017 - Towersey, Oxfordshire

England's Medieval Festival - 26th Aug 2017 - Herstmonceux Castle, BN27 1RN, East Sussex

Liverpool Sea Shanty Festival - 26th Aug 2017 - Liverpool, Lancashire