US citizens don't require a tourist visa nor K-ETA to enter South Korea.
October is the best time of year to visit Korea. Temperature will be high 68 low 48. Since the venue is outdoor, bring a jacket in case it gets chilly in the evening.
Business casual/Suit for men and women is perfect for Korean wedding. There are no color restrictions. Feel free to wear Hanbok (Korea traditional clothing) since it's going to be a Korea traditional wedding! Of note, sleeveless, strapless, and V-neck dresses are culturally inappropriate in Korea. Err on the conservative side.
Subway is the best way to travel Seoul. Get a T-money card (for all kinds of public transportation) at the airport/subway station/convenience store (CU, GS25, Ministop, and 7-Eleven) and add funds to the card.
Subway Korea Subway Korea is a subway app that provides the subway system map in five major cities, and also includes timetables, road maps, and pit stops. All you have to do is select the departure station and station you wish to arrive at, and the app will calculate the best route via quickest or with the least amount of transfers. Naver Map This app is a necessity if you want to get around Korea easily. It not only helps you find your destination and navigate roads, but also keeps track of the arrival time of all the public transportation in Korea. Google maps is also works(ish) but not recommended. And.. Google Translate!
Hello ; Ahn-nyong-ha-se-yo Thank you ; Gahm-sah-hahm-ni-da. Yes ; Neh No ; Ah-nee-oh Too Spicy ; Neo-mu mae-wo-yo