Utsavasaṅketa (Utsavasanketa) is a locality and the inhabitants of that locality, mentioned in Mahābhārata (Mahabharata). Before the Rājasūya Yajña (Rajasuya Yajna)of Yudhiṣṭhira (Yudhishthira), Arjuna set out for conquering all sides, and defeated these people. It is also said that Nakula, too, conquered them.
It appears that this tribe called Utsavasaṅketa lived scatteredly in large portions of North-Western India. It is described in Digvijayaparva of Mahābhārata (Mahabharata), that Arjuna defeated seven groups of this tribe —
gaṇānutsavasaṅketānajayat sapta pāṇḍavaḥ.

After conquering them, Arjuna went off to Kāśmīra. Again, the Utsavasaṅketa people whom Nakula defeated, lived in Puṣkarāraṇya (Pushkararanya)–
punaścaparibṛtyātha puṣkarāraṇyavāsinaḥ
gaṇānutsavasaṅketānajayat puruṣarṣabhṣaḥ.
In Raghuvaṃśam by Kālidāsa (Kalidasa), these people are referred to as mountain-dwelling tribe. In course of describing Raghu’s Digvijaya, the Utsavasaṅketa tribe is mentioned there —
tatra janaṃ raghorghoraṃ parvatīyairgaṇairabhūt.
nārācakṣopanīyāśmaniṣpeṣotpatitānalam.
śarairutsavasaṅketān sa kṛtvā viratotsavān.

According to M.R. Kale, editor of Raghuvaṃśam, these Utsavasaṅketa people were inhabitants of Hatak or Ladhakh region. However , V.S. Agrawala, in his book, opines that they lived in Kulu and Kangda  region. It is further said that the Utsavasaṅketa people conquered by Nakula, lived in Puṣkarāraṇya (Pushkararanya) –or modern Pokhran in Rajasthan.