Do not park illegally, your car WILL be towed. After ~ 6 PM or 7PM you can park on the street for free, if you can find a spot. If you are willing to walk a little, I can help you with a garage that will be about $10 as long as you enter after 5PM or so. (Noble parking on 310 East 40th Street between 1st and 2nd avenue is one place) - it is a 20 min walk to MSG or ~ $7 for a cab with a tip. The parking on the side of MSG will cost you ~ $50 for the night.
DO NOT SMOKE JOINTS on the street. Smoking in the venue is generally ok bu don't flaunt it. If you must smoke outside, at least walk to 9th avenue - quieter there. But even there you must be discrete. No smoking is safest - one hitters if you are very discrete or perhaps in a crowd.
Any other hints would be apprecaited
May God bless and keep you always
May your wishes all come true
May you always do for others
And let others do for you