Declension table of ?sotsava

Neuter	Singular	Dual	Plural
Nominative	sotsavam	sotsave	sotsavāni
Vocative	sotsava	sotsave	sotsavāni
Accusative	sotsavam	sotsave	sotsavāni
Instrumental	sotsavena	sotsavābhyām	sotsavaiḥ
Dative	sotsavāya	sotsavābhyām	sotsavebhyaḥ
Ablative	sotsavāt	sotsavābhyām	sotsavebhyaḥ
Genitive	sotsavasya	sotsavayoḥ	sotsavānām
Locative	sotsave	sotsavayoḥ	sotsaveṣu

Compound sotsava -

Adverb -sotsavam -sotsavāt