Don't know when they where in Nottingham but the Family were famous from the early 1900's for their death defying act usually performed without a safety net and toured extensivley http://en.wikipedia.org/wiki/Flying_Wallendas
This:~ http://www.wallenda.com/index.html
is the Official Website of the Wallenda Family.
At the bottom is an email for Tino Wallenda,if you email him he might know the dates you are seeking?
Good Luck.