Check with the cathedral office but I don't believe it is. It actually has a full schedule of daily masses along with other liturgies and events.
They fo Book weddings. Check with the Secretary of the Cathedral, they can tell you more. Google the Cathedral, and telephone number
I have to agree with those above. This place unfortunately gives all the free time they have which isn't much.
I believe Brian is correct it's open daily for tours and such you may be able to use it for an event but you would have to schedule it well in advance
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