For Sacramento Kings games, doors open 1.5 hours prior to tip-off.
The doors will probably open an hour before the game.. depends on staff and how early the will open the doors..when i went to the jay z concert they let us in an hour before the concert started.. hope this was helpful.
For college games it was an hour before tip off.
I'd bet you could get in at 6
Don't know about games but concerts are 30 minutes before show time
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