If you have a micro wedding, no mics are needed – those 20 or so guests will hear everything without problem.
But big weddings and especially grand weddings sure require microphones. If you’ve invited 50 or 100 or more wedding guests, make sure they’re able to hear the officiant, your vows, your “I do’s”, etc. Prepare microphones for the officiant, the two of you, and a few extra mics for those people who will speak at your wedding ceremony.
Also, mics are useful when you’re having a videographer working your event. You will get high-quality sound for the video.
