During the lunar eclipse, they should not eat. If possible, avoid defecating. Photos of the deities can be seen but deities’ darshan should not be there during the eclipse. But either before or after the eclipse, eating, darshan etc. can be done. During the eclipse, they can chant Hare Krsna; they can give class. In India, optionally, they may go to some sacred river, if nearby, stay in the river for the whole duration of the eclipse and chant Hare Krishna. If there are any other questions, please ask me.
Your well wisher always,