Got Any ABBA? The Rules of DJing at Weddings

My mate/fellow disc jockay is playing his first wedding this weekend and asked me for some tips. In lieu of any new ideas/content, I thought I'd post it here. Once I've reassembled Niall and Gaby's wedding mix (from two weeks ago in Brighton), you'll be able to hear my theory put to practice here - PLUG! - and if you're friends with them go here to see THE Florence and the Machine congratulate them (sort of) on choosing You Got The Love (not her version) as their first song. Kudos.

• If it's not too late, find out what the happy couple like and play that. The old rule of getting the ladies dancing is doubly true if one of them is a bride.
• Be prepared to play cheese, but don't play stuff (unless asked) too far from your comfort zone. If you think tunes are absolutely gash then you - and the guests - won't have any fun. 
• A related note - play requests if you can, but if you don't have songs just tell people you don't. If you have a comrade to fend off the requests, even better. Bloody requests.
• Take risks. You'd be surprised at what a drunken, captive, all-ages crowd will go for, so try it and be ready to mix out if it bombs (my crowd wasn't feeling the Theme From Shaft!). If you're going late, go hard - by then the old folk will be ready to go home, and the youngsters will be ready to GET DOWN.
• Having said that, play a set with a fairly broad age appeal. 80s is a good place to start as it appeals to the young(ish i.e. 30-odd) and their aunts and uncles alike. Have some Northern Soul or (original) R&B or Beatles on hand in case a granny wants to shake her tailfeather.
• Billie Jean. Everyone likes it - literally.

And no, I haven't got any Mavericks.