Niti Shastras explain the circumstances when one may attend a function even without invitation: ‘They should go to a Yagna even if they have not been invited.’ Thus one may attend religious functions, Yagnas, Katha etc. even without an invitation.
They may go to such houses to beg for food and do so by standing outside and calling out to get the attention of the household. They may enter such houses for purpose of religious discourse, Padhramani etc. but not otherwise.
They should spend their time in devotion to God. Shatanand explains, ‘Sadhus should not allow even the minutest of time to pass devoid of devotion to God through Kirtana etc.’ They should not spend their time wastefully in other worldly things. In this way they should strive to become Atmanivedi Bhaktas - the highest attainment in Navadha Bhakti.