There was a Interfaith worship service at Yearly Kos, the conference associate with mega-political-blog Daily Kos. The readings included a portion from Universalist minister Olympia Brown, but I mention it because (1) the whole thing might be found in any number of Unitarian Universalist churches and (2) the liturgy is online. Pictures, too. (I love the image of the tote bag used for the collection.)
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We have been practising this kind of interfaith services in the yearly meetings of religions in Catalonia for quite a few years now, and I’d say that most if not all UUs would feel very comfortable attending those services. Actually, if interfaith liturgies and gatherings keep growing and spreading, soon UUism, as it is conceived now, will be unnecessary and therefore dispensable.