You get a beautiful envelope in the mail. Surprise! It’s not just a heads-up that they're getting married; it includes an RSVP postcard that you must fill out and send back.

Pro-Tip: You can't just circle "attending." You actually have to cross out the printed honorifics (like Go or Sama) with a double line. To be extra polite, add the phrase "Gladly" (喜んで) before the word "Attend," and "I will" (させていただきます) right after it. Try to drop it in the mail within a week. However, if you have to decline, wait a little bit so it doesn't look like you were too eager to say no!

The golden rule is universal: do not wear white! Men usually rock classic suits, while women wear dresses.

The fun difference? Japanese wedding guest dresses are usually quite fancy and elegant! Many women even hit the salon bright and early to get intricate, beautiful up-dos. If you ever spot a group of women on a Sunday morning with gorgeous hair and party dresses, they’re definitely on their way to a wedding.

When it comes to the cash gift (goshugi), the standard starting point is 30,000 JPY. If you are super close to the couple, that jumps to 50,000 or even 70,000 JPY.

Notice a pattern? You generally avoid even numbers (like 2, 4, or 6) because they can be "divided" in half—a big bad luck superstition for a newlywed couple! Since the reception features a very expensive full-course meal and you get a lavish return gift, 30,000 JPY is the polite baseline.

You'll hand over your cash gift after the main ceremony, right before the reception. You can grab a special, decorative wedding envelope at any convenience store or stationery shop.

But beware of this etiquette trap: the fanciness of your envelope must match the amount of money inside! Slipping a small amount of cash into a massive, heavily decorated envelope is actually a faux pas. Keep it proportional!

Japanese weddings are often an all-day affair, broken down into three main events: The Ceremony, The Reception, and the After-Party (Nijikai).

Unlike some weddings where anyone can drop in, the ceremony and reception are intimate, assigned-seating events strictly limited to close family, best friends, and direct coworkers. You don't just eat and run! You sit at your assigned table, enjoy a full-course meal, listen to speeches, watch fun performances, and take photos. Keep an eye out for the Oironaoshi (outfit change), where the bride swaps her white dress for a colorful gown or a stunning kimono!

This is where things get loose! The Nijikai is essentially a giant party mainly for friends. You just pay an entrance fee (around 5,000 to 6,000 JPY) and enjoy drinks, games, and bingo with prizes. If you aren't super close with the couple, you might just get invited to this fun, casual segment of the day.

Guests definitely do not leave empty-handed! While you might receive some regional treats, the absolute trendiest return gift (hikidemono) right now is a gift catalog.

Instead of getting something you might not need, you get a beautiful catalog where you can order your own gift! You can pick from designer dishes, bags, outdoor gear, or even gourmet food vouchers. (I once got a catalog worth 3,000 JPY and used it for a fancy dessert lunch in Ginza!)

Unlike fast-paced weddings that wrap up in 30 minutes, Japanese weddings are slow, deliberate, and full of thoughtful celebration. If you ever get an invitation, bite the bullet on that pricey cash gift and go—it is an absolutely incredible experience!