NTD or New Taiwan Dollar. It's about 30 NTD to 1 USD. Keep in mind Taiwan is a cash heavy economy, so take some out of the ATM when you get here. And if using a credit card, given a choice between USD and TWD/NTD, I would recommend you pick NTD, you get a better exchange rate in my experience.
Same as the US, same plugs and everything.
Taiwan will be 16 hours ahead from Seattle time in December. So add four and flip am/pm.
Please let us know by 10/15 for the actual wedding invite. And keep us apprised of any changes please.
A suit if you can for the gentlemen. A nice cocktail dress or a gown if you can swing one for the ladies.