I was just planning a few days out this summer and it dawned on me just how many wet and messy events there are in the UK alone. I wonder how big the list would be worldwide! Here are a few links. There are thousands of images of these events around.
The World Gravy Wrestling Championships, Stackstead, Lancashire
https://www.flickr.com/photos/adrianlines/4945128056/in/set-72157624723370897
Lowland Games, Nr Langport, Somerset
https://www.flickr.com/photos/lens_buddy/8007253417/in/set-72157630909119574 - Raft Race
https://www.flickr.com/photos/lens_buddy/8012310622/in/set-72157630909119574 - River Knock Out Challenge
https://www.flickr.com/photos/lens_buddy/8030571511/in/set-72157630909119574 - Mud Wife Carrying
https://www.flickr.com/photos/lens_buddy/8057796302/in/set-72157630909119574 - Mud Wrestling
Swamp Soccer World Cup, Strachur, Argyll
https://www.flickr.com/photos/26605296@N06/5873075823/in/set-72157627052384466
World Tin Bath Championships, Castletown, Isle of Man
https://www.flickr.com/photos/26605296@N06/5873075823/in/set-72157627052384466 - Snake Race
World Bog Snorkelling Championships, Llanwrtyd Wells, Powys
http://www.ephotozine.com/images/bbcode/77516/1-bs.jpg
http://www.bbc.co.uk/blogs/legacy/magazinemonitor/bog424getty.jpg / http://www.bbc.co.uk/blogs/magazinemonitor/bog424getty.jpg - Mountain Bike Version
Braughing Wheelbarrow Race, Braughing, Hertfordshire
http://www.thestudiowithoutwalls.co.uk/blog/2013/7/braughing-wheelbarrow-race
The Mad Maldon Mud Race, Maldon, Essex
https://www.flickr.com/photos/pg23/5674602429/in/photolist-9DrPAV-9DrPEt-9BDVbW-9DuGUd-7r9h1p-egKbGz-9DrPtP-egKmRX-egQWqd-egQWUA-egQWFj-egKmzK-9BJdyE-9DrPre-9BJcxL-egKmmK-9BCJTf-egR7zb-egKnF8-egR7cs-5PPWWB-9BJazJ-9BHdiG-9BD53N-9BJ4W1-bRzY5x-bRAkok-9BzArg-9BJg7o-9BJ7t3-9BJgHQ-9BFjzr-9BCYm7-9BJjDE-9B
Mapleton Bridge Jump, Mapleton, Derbyshire
https://www.flickr.com/photos/60293485@N06/8333958803/in/set-72157632406474786
Christmas Swims - there are loads of these
https://www.flickr.com/photos/melopics/8312608059/in/photolist-dEyhLB-iAYKxK-94tLWt-dKUYfX-iAWVQG-5Mc3wE-5M7Per-4fUiL8-iCSwPZ-4fWA8Q-iAWVzb-7qhMj6-953KNa-dL1swL-iAWXr7-iAYGgp-iAXLoU-94zwkq-iAYjJz-iAXPz5-97CRd8-97GGgL-97G51L-iAZLAT-uuaA1-96xdvS-5Qw6jV-vpCSx-iAXPCt-iAYRpJ-iAX9DP-iAYjEu-4iJz7L-97G6CN- - Lowestoft, Suffolk
http://media.irishcentral.com/images/419*428/Christmas+Day+Swim.jpeg - Dublin, Ireland
http://pravda-team.ru/eng/image/photo/3/7/7/72377.jpeg - Porthcawl, South Wales
https://c2.staticflickr.com/8/7014/6569938563_c3c8c7fe52_z.jpg - Hunstanton, Norfolk
http://shanethornton.co.uk/wp-content/uploads/2013/12/ventnor-boxing-day-swim-026.jpg - Ventnor, Isle of Wight (good use of the Christmas jumper!)
http://www.flickr.com/photos/lomokev/82520876/ - Folkestone, Kent
http://www.exmouthjournal.co.uk/polopoly_fs/1.3142518.1387798958!/image/1643394767.jpg_gen/derivatives/landscape_630/1643394767.jpg - Sidmouth, Devon
http://news.images.itv.com/image/file/312982/image_update_img.jpg - Tenby, South Wales