A festival held from time to time (kálánukálam) in Rájagaha. (Perhaps elsewhere as well. The BuA. p.102 says it was an annual festival held all over Jambudípa and was as old as Dípankara Buddha; see also J.iii.538). It was held in the open air in the afternoon and was attended by all people of all grades of society from Anga and Magadha. Special seats were prepared for the more eminent of the audience, and the festivities seem to have consisted chiefly of nautch dances (SNA.i.326). According to the Vinaya accounts (Vin.ii.107f, 150; iv.85, 267) there were also singing and music, and the festival was attended not only by laymen, but also by members of religious orders, for otherwise it is unlikely that the Sattarasavaggiyas and the Chabbaggiyas would have been there. Food was provided as well as amusements. Buddhaghosa (Sp.iv.831) explains the name of the festival thus: giraggasamajjo ti girimhi aggasamajjo girissa vá aggadese sammajo, and tells us that it was announced for seven days before its commencement, and was held on level ground under a shadow of a hill and outside the city. Perhaps it was originally a pagan religious festival, a survival of old exogamic communistic dancing (See Dial.i.7, n.4; VT.iii.71, n.3).
It was at a Giraggasamajjá that Sáriputta and Moggallána decided to leave the world (DhA.i.73f.; AA.i.89, etc.).
The Sanskrit equivalent is Girivaggu-samágama. AvS.ii.24.