I placed all my corrections between two (), comment if something is not clear.
Is (to) set a date and find the location.
out the menu, (as well as the) entertainment.
input from other(s) and (assign) them tasks to (complete).
mail the invites out(no s).
or event (got underway, I would)
the guests(s) (were) having a good time.
1. Cort and his dad go fishing and come home from bottle creek
2. Cort goes to Liza's house and a hurricane like storm starts to come.
3. Cort and Lizas parents are away and they have to go look for them.
4. They get lost in the woods but manage to reunite with Cort's dad then later Liza's mom
5. They go back to their normal lives after the storm
(sorry but I only got 5)