Outdoor event

I'm hoping for good weather on Saturday 18th June when I'll be doing a book signing at:
Naburn PTA Tabletop and Craft fair, at Naburn Primary School, York. 11am - 1.30pm I try to keep to indoor events usually but this one has the option of being indoors in case of rain, so no need to start thinking about gazebos.
I've heard a lot of traumatic stories about gazebos - anything from them tearing themselves apart in an attempt to escape their tethers, to actually flying away out to sea when their ropes weren't up to the job, so I've come to the conclusion that, far from being an inanimate object of shelter - they are in fact a wild beast intent on escape...