Wedding fund in lieu of gifts: Tacky or practical?

Since my partner and I are financing our wedding, we’re being very mindful of expenses. We really don’t need wedding gifts, but just pitching in for the wedding itself would be really helpful. Is it tacky to delicately mention a wedding fund in lieu of gifts? I don’t think this is different from a registry, but I’m not sure of the etiquette here. Our dream is to have something super casual with our wide circle of friends, but we can't do this without the guests pitching in a little bit for open bar and food expenses.

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