Call ahead
I'd agree. They are very conscious of allergies etc but you should definitely reach out and make them aware of your restrictions. If you are having a party there, they will surely cater to your specific needs and still not make the rest of the party suffer.
I'd recommend calling! Especially if you're planning a larger get-together. AFAIK they do, but since you have severe allergies, I think it'd be best for you to reach out.
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