Indeed, it is possible. You just have to ask for it while ordering.

Chuseok is one of the largest and most widely celebrated holidays in South Korea. A time of happiness and reconnecting as families gather, chat, and have great feasts. Meaning not all stalls will be opened even though the website says it’s open all year round except Sundays.

Hi, Gwangja market opens as early as 9am, closing time varies, retail shops close at about 6pm except for food shops close about 11pm. Retail shop close on Sunday except for food stalls. Since it is a market, it will be always busy.

すみません。この市場ではトイレにも行ってませんし、生のユッケを食べたお店でもトイレはいかなかったです。さすがにトイレの場所わかりませんでした。日本と比べて不衛生なのでもしあったとしてもアルコールシート持っていってください。ティッシュも私はカバンの中にたくさん入れておきました。

We went on a Sunday, and while the market was open, most of the shops were closed. The food section seemed to be going full steam though.

Hi. Sorry for replying you so late. But as it's a market famous for shopping.. all days of the week. It's crowded. But lesser on weekdays compared to weekends.

Hi, Strangely, I’ve found beautiful and cheap Korean ceramic at Insadong in the tourist and commercial street where is situed Ossuloc (170 Gwanhun-dong, Jongno-gu) In the same side of the street but by the end, I’ve bought beautiful ceramic in a small shop where the owners are the artists built the ceramic. Or else, in shops of the National Museum of Korea it’s possible to found also beautiful small potery pieces.

Hi, I'm not too sure either but here is the Offiicial Korea Tourism Organisation site relating to the market. Address 88, Changgyeonggung-ro, Jongno-gu, Seoul 서울특별시 종로구 창경궁로 88 (예지동) Type / Products Traditional Markets / Silk, dress material, fashion apparel, agricultural and marine products, bedding, handicrafts, lacquerware inlaid with mother-of-pearl, etc. Inquiries • 1330 Travel Hotline: +82-2-1330 (Korean, English, Japanese, Chinese) • For more info: +82-2-2267-0291

Dongdaemun is a wholesale centre selling fashion fabrics. As such it will be closed. Gwangjang is a food market. I am not sure about that.