si son reuniones "alegres" digamos, dónde hay actividades, música, etc., es muy común en los EEUU llamar estas reuniones singles parties o singles mixers.

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Note added at 43 mins (2006-03-05 17:03:03 GMT)
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See references.

Suerte.

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Note added at 1 hr (2006-03-05 17:36:04 GMT)
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Given that the "reunion de solas y solos" is used in Spanish, rather than the expected "solteros", I think that "Lonely Hearts" might be indicated in the translation, *slushy* though it may be....