Michael O'Hare wonders why museums haven't gotten more attention as either (a) first date locales or (b) places for smart young people to meet other smart young people. There are a number of logistical reasons for this: museums are frequently located in business districts that shut down at 6pm or places that don't have any adjacent restaurants or coffee shops. They tend not to do a very good job of advertising events to encourage regular patrons; most museums still operate under the assumption that almost all of their visitors will show up exactly once. And there's a certain appeal to feeling like you're part of a crowd, which museums can't offer unless they're holding a book signing or other event. I believe the New York Public Library has had some success in becoming a hip venue by hosting talks and wine & chees nights and the like. I feel like I've heard of similar programs at LACMA as well, but it's unclear whether strategies that work in the country's two largest metropolitan areas are portable to the smaller cities.
O'Hare separately laments the rental of museum facilities for large private events (primarily weddings and conferences). It's better to think of rental offerings as a "public option" of sorts. The rates for museum rentals, as well as for other public venues such as city parks, are usually modest compared to private alternatives—hotels, conference centers, and idyllic properties held by the bridal-industrial complex. Without public properties as an anchor, the obscene mark-up at private venues would be even worse. In addition, getting more people into museums as opposed to hotel ballrooms might open some eyes to the value of public spaces. Obviously if every summer weekend is rented out, that's a problem, but even fairly regular rentals won't lead to the end of the world.
(photo of the Bilbao Guggenheim by Flickr user betta design)