What's the best way to get nice clean sound of the ceremony and speeches at a wedding?

I’m shooting my first wedding in November and I’m trying to work out the best way to get sound from both the ceremony and the speeches afterwards. My main problem is that the clients have said they would prefer not to have lapel/lavalier mics if at all possible.
I know that the speeches will have a microphone going out to a bunch of speakers so maybe I could take sound from the mixer onto a zoomH4n or similar… My other idea was to set up a shotgun mic recording to a zoomH4n on or near to the action…
thoughts?