I'm pretty sure there are options on the panel behind the glove box lid? Is it yours or hired for a wedding? I think the options are to change it from auto to manual operation i.e. up and down when you want rather than when it wants....
There is a button in the glove box marked "Manual / Auto" with a little pic of the Spirit - this will prevent automatic operation. There is another button that will manual toggle the position whilst in this 'manual' mode.