Yes,
There is a ticket window, and tickets are often available weekdays (and sometimes weekends/holidays) on a day-to-day basis for the Nagoya Basho. You should try to get there as early as possible, as the most economical seats tend to sell out first, leaving only the more expensive box seats available for late-comers. You may even get lucky and find tamari-seki being sold (a little expensive, but a great experience).
Day 2 is not a problem for anybody but the Kyokai and the chaya.
Doreen Simmons <jz8d-smmn@asahi-net.or.jp> [EndPost by Doreen Simmons <jz8d-smmn@asahi-net.or.jp>]