Get there early so that you can find parking on the street. Otherwise your best bet would be to park in a nearby hotel parking lot and walk over. SN: my sister got married at the Grand. We stayed at the hotel Dupont and took an Uber down to the Grand. It's also close enough to walk if you don't mind a little exercise.
I don't think that they have a designated parking space
The earlier u get there the better chance of getting a close spot. Be careful some area's will be towed.
The best lot (in my opinion) is at King St and 7th Street. Usually $3. You can exit up through the attached hotel (the Double Tree). There is a back entrance to The Grand on King Street just diagonal from the Double Tree Hotel so it is a very convenient location.
Thanks! Your answer is awaiting moderation.