Information on DAY 21 of the nuntarriyašḫa- festival has come to light only through the recent discovery of the joins to Outline.11 (KBo 51.130+). According to this revised outline, the king visits the temple of the Sun-goddess in the capital on that day. A great assembly follows, although it remains unclear whether this ceremony takes place in the temple itself or, as is customary, in the ḫalentu- complex. In addition, the arunitt(a)- festival is performed in the House of the Major-domo. Finally, two supervisors of the shepherds perform the celebration of Miyatanzipa.

Despite the newly available information, no day-tablets corresponding to DAY 21 have so far been identified.

The earlier edition of the nuntarriyašḫa- festival includes only a brief notice concerning the events of DAY 21 (Nakamura M. 2002a: 114).

Celebrations identical to those described for DAY 21 are attested in KUB 25.27 i 28′–32′ (CTH 629). This passage further specifies the required offerings: two bulls, twenty-four sheep, flour, and beer.