The Japan-Korea Exchange Festival celebrates the anniversary of political normalisation between Japan and Korea at Komazawa Olympic Park. You’ll get to watch a number of performances including Korean choirs, dancers and tae kwon do displays. There's even a secret K-pop concert taking place on Sunday, so you'll want to make sure you are around for that. Look forward to plenty of booths serving traditional Korean food and drinks including makgeoli (Korean rice wine). You can even try on traditional Korean clothing and learn about the culture.
Note that reserved seating for the K-pop concert is fully booked, but you can still visit the festival and watch from afar.