If they permit it and if your wedding ceremony is small it can be done outside on a nice day. I don't see how any reception could be had. There is no hall there.
The place is rather small, but go ahead and call them.
Get your info from the 'horses mouth' ! http://japanphilly.org
No, it interferes with the preservation of the site so at this time they do not offer this opportunity.
The horticultural center next to it does receptions.
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