Copyright is granted as soon as you create the image. Making it official just makes it easier to get money but it also costs a lot of money and is on a per image basis.
So far as I know there are no restrictions on where you can shoot or what you can shoot other than things like trademarks. For information on people you should probably read up on model releases and when and what you need them for. As for where, some events/venues have a contract photographer that has exclusive rights to the event/venues in which case you need his/her permission to shoot.
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