No, you can take Disney transportation to the campground to enjoy the activities. One day, coming back from one of the parks, we met some people on the bus who were doing that for the dinner show. None of the activities we have done required any kind of check-in or verification that you are staying there, but there may be some that do.
No
The campfire sing a long is free, no need to book in advance, bring your own smore fixins if possible, and stay for the movie...
Not sure, seems someone you know should be there to get in gate
Not sure about the campfire sing-along but everything else is fine.
No. You can take a boat or bus to the campground and enjoy the amenities. Like most Disney functions, any of the character events should be booked well in advance.
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