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.
Swimming
Present progressive tense refers to something in action, ie: Paul is walking to the store.
You made the mistake, since the sentence said I
rip user you will be missed
YourHope 2018-2018
Deleted for known reason
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D. a logical interpretation of an observation.
I feel like this answer should've included that it's on the basis of evidence and reasoning