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Consider creating a page on your site for both terms. Weddings are a big deal for people and ultimately, they are going to book a venue that they love and relate to. If you have a great venue, you shouldn't be afraid to list a few other venues (perhaps not your primary competitors) that are good alternatives. Perhaps you could even make a referral arrangement with them and earn some income from people who book their venues from your page. Your home page could target the singular, Wedding Venue term - and of course highlight your venue. An additional page would be created to highlight the plural, Venues for Weddings, and the content would focus on the Top Venues in your city. It's a great chance for you to highlight what is special about your venue and deliver value to the searchers of either term.