Bay
If you want to have a tsunami at your wedding, you need to make sure you have it at the bay. Anywhere more inland, and the tsunami won't reach it in time.
Picture the tsunami coming towards your beautiful wedding as you stand by the bay. It's not safe, but it's memorable!
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How did you get a tsunami to show up in the bay in the first place? By throwing a bunch of uranium (うら) in there, of course! Its highly unstable nature can make any body of water, especially a calm bay, turn violent.
Imagine throwing buckets of uranium into the bay. It only burns your hands a little. And now they glow green, just like the bay does!