I've just landed a last minute invite to the Chelsea Flower Show! It's a work thing, so it's to go in some posh bit I suppose- although I've never been so don't really know how it all works. But..... what on earth should I wear?? And is it true about needing to wear flat shoes? Will we actually be walking around on grass (I know it's a flower show but have no idea what the set up is). Any ideas gratefully received. Thanks....