I would use a small "


I would use a small "fill" light. Set the manual controls for a couple f-stops down from ambient. Do a test with the fill light and set from that, even a dry run the day before might give you a good confidence factor. Let the sparklers go over exposed- better than losing the total shot.
***My main "fear factor" on this is clothing catching on fire. A lot of sparklers can generate too many opportunities for burns when that close to each other. If they are held high to create an archway over the bride and groom, suggest a fire extingrisher be handy- this is not a joke.
Hope it turns out great!

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