Many years ago, prior to the establishment of TRA's for the Red Arrows, they were scheduled for a display at RAF Odiham. On the same day (and all week in fact), there was a major gliding competition in progress at Lasham. For those who are unaware, Lasham is about 4nm from Odiham.
The Reds started their display, but broke off after about 10 minutes and departed complaining about a glider and tug combination which kept getting in their way! (Lasham were carrying out their 'massed launch' procedure at the time, using about 20 tugs to get 100 odd sailplanes airborne in as short a time as possible)
It would seem that, although the Lasham competiton organisers were aware of the Red Arrows display, the Reds for whatever reason had either failed to brief about the gliding, or had blandly assumed the gliders would keep clear of them!