अन्यविशेषश् चेत् अन्यपर्वणि तदा तत् अनुपर्व इत्य् आहुः
Transliteration (IAST)
anyaviśeṣaś cet anyaparvaṇi tadā tat anuparva ity āhuḥ
If there is a different distinguishing feature on another sacred day, then they call that an anuparvan (a secondary parvan).