The bit in the river is not really a "show", its 'just' people washing the horses before putting them on sale. Here's some Flickr links:
https://www.flickr.com/photos/jamestodd60/27677124342/in/faves-105715846@N06/
https://www.flickr.com/photos/jamestodd60/27499803040/in/faves-105715846@N06/
https://www.flickr.com/photos/jamestodd60/27498978480/in/faves-105715846@N06/
https://www.flickr.com/photos/jamestodd60/27742907776/in/faves-105715846@N06/
https://www.flickr.com/photos/imperfectvisions/27515616541/in/faves-105715846@N06/
https://www.flickr.com/photos/earthguardianangel/27430572252/in/faves-105715846@N06/
https://www.flickr.com/photos/earthguardianangel/27233668270/in/faves-105715846@N06/
Here's some from last year, which I think haven't appeared here before:
https://www.flickr.com/photos/karenmorris/18681039068/in/faves-105715846@N06/
https://www.flickr.com/photos/adrianlines/2560845083/in/faves-105715846@N06/
https://www.flickr.com/photos/keri72/18780838515/in/faves-105715846@N06/
https://www.flickr.com/photos/keri72/18593475268/in/faves-105715846@N06/
https://www.flickr.com/photos/keri72/18593565100/in/faves-105715846@N06/
https://www.flickr.com/photos/60772566@N06/18968445273/in/faves-105715846@N06/
https://www.flickr.com/photos/jimmonk/18588135834/in/faves-105715846@N06/
https://www.flickr.com/photos/jimmonk/18622624840/in/faves-105715846@N06/ (before)
https://www.flickr.com/photos/jimmonk/18622555868/in/faves-105715846@N06/ (in)
https://www.flickr.com/photos/happydayzphotography/18501707919/in/faves-105715846@N06/
https://www.flickr.com/photos/wittoboyo/18828202036/in/faves-105715846@N06/
https://www.flickr.com/photos/wittoboyo/18849296252/in/faves-105715846@N06/
https://www.flickr.com/photos/wittoboyo/18233793183/in/faves-105715846@N06/
https://www.flickr.com/photos/64742149@N06/17998184684/in/faves-105715846@N06/
https://www.flickr.com/photos/ianlivesey/17907228173/in/faves-105715846@N06/
https://www.flickr.com/photos/happydayzphotography/18429867758/in/faves-105715846@N06/
You will normally find more by going into the relevant photostream. Enjoy.