Things for the outside:
Electrical: Extra fuses, elect. tape, Surge Protector
Plumbing: tape, Y connector, hose repair kit, extra washers
"Stuff"...chair(s), small table, step to get in/out, outside rug, tablecloth (plastic), tablecloth holders, dog play crate.
lights...be careful of putting cute things on the awning...in case you need to close it quickly because of weather! More and more people are getting rope lighting and putting it on the ground below their awnings!
Just remember, if you put lots out, you have lots to remember to put back. Also, the weight! I carry a George Foreman grill.