Yes, or you could chance it, but be ready to move when the reserved group arrives... If it was previously reserved. Also, the city puts a completed copy of your request at the table you're using to let people know when that space will be occupied.
I really don't think it matters at all. It's a neighborhood park, and I've seen people have parties here before, and definitely don't have a permit. It will be completely fine. Have fun :)
I don't think you do for small parties. If the party is large and you plan on being there most of the day it would probably be a good idea to get the permit
Yes you need a permit from the city. Not sure of the cost.
Thank you all for your responses it is greatly appreciated.
Thanks! Your answer is awaiting moderation.