A type of Sāmācārī (rules of conduct qua etiquette, formality and convention);
to invite Guru etc. for partaking the substances like food etc. received in bhikṣā (accepting food etc. by going to houses for collecting them in conformity with the canonical instruction).
chaṃdaṇā davvajāeṇaṃ.......
(U 26.6)
See - Nimantraṇā.