Insurance for Wedding Planners - Help please!!!

A wedding planner friend of mine said she has a client that wants to hire her for day of coordinator. But...she wants her to have liability insurance for herself and her assistant. My question is what do you other wedding planners have in the way of insurance? What does it cover? And why would a bride insist we have it?

I've found plenty of info on the internet about insurance the couples can buy such as WedSafe. But I'm talking about insurance we as planners would buy.

Any info would be very much appreciated!

Thanks,

Melissa