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Pacifico Yokohama, which is next door to the Intercontinental Yokohama Grand Hotel.
There is a Haneda-Airport Limousine Bus (https://hnd-bus.com/airport/h-yamashita/) with stops at the InterContinental Yokohama Grand Hotel, Westin Yokohama, Yokohama Royal Park Hotel, Yokohama Bay Hotel, and some other locations, ending at the Red Brick Warehouse.
There are also a number of trains between the airport and Yokohama.
The Narita Express [NEX] train (https://www.jreast.co.jp/multi/en/nex/) is the fastest way to get to/from Narita Airport. NEX Train takes about 1 hour between Tokyo and Narita Airport. All Narita Express trains will have a stop at Tokyo. Some (but not all) Narita Express trains also will stop at Yokohama.
From the Yokohama station, there are local trains which can take one to the general area of the IETF meeting.
Electricity and Plug information for Japan Plug types A/B
Craft Sake Shoten https://www.craftsakeshoten.com/
Cute little sake shop with a wide variety for tasting
〒220-0005 Kanagawa, Yokohama, Nishi Ward, Minamisaiwai, 2 Chome−18−3 島田ハイツ 2F
A vegan restaurant located in Jiyugaoka serving dishes with plant-based ingredients and fresh vegetables
BIF Luz Jiyugaoka, 2-9-6 Jiyugaoka, Meguro-ku, Tokyo, 152-0035
3-minute walk from the front exit of Jiyugaoka station on Tokyo Toyoko Line and Oimachi Line
Open 11:30-21:00 (last order 20:30)