Q.  What to do about the siyum Erev Pesach? Can it be done by phone, online or zoom?
A. On question 531 regarding someone joining a siyum Erev Pesach while still traveling via telephone we wrote; “On question 198 we mentioned: If you learned together (a tractate of the Talmud) with a group but now are on vacation somewhere else, can you join (the siyum fleishig banquet during the nine days) via telephone? We answered; Horav Shlomo Miller’s Shlit”a ruled that if you learned the whole tractate you can join the siyum via telephone. However, if you did not study, you cannot just dial – a- siyum. Similar opinions are to be found in other Poiskim (Mekadesh Yisroel, Pesach 256, et al.).
Likewise if one learned the Masechta to be finished and is on his way to the siyum he could join the siyum via telephone or online.”
In our singular situation when a very dangerous pandemic is raging the Rov’s opinion is that since there are grounds as is for people not fasting, one may join in need, a siyum on the phone or online.
Rabbi A. Bartfeld as advised by Horav Shlomo Miller Shlit’a