Nintendo's FY 2015 Third Quarter Financial Results Briefing
Time: February 3, 10.00 AM (JST) / February 2, 08.00 PM (EST)
Location: Hotel New Otani Tokyo (likely in the Tsuru banquet hall)
TSE operating hours are 09.00 - 15.00 (JST). I believe the earnings release will come on February 2 after the market closes.
Tsuru banquet hall:
Hero of Legend, feel free to include this in the OP if you like.
Shame Nintendo doesn't offer webcasts of these presentations. Sometimes other firms film their events, but it's not common.