Is there any minhag (custom) when a person makes a siyum (finishes a mesacta or anything else that a "siyum" can be made on) that he himself doesn't say tachnun on that day? What about in any of ...
Does a minyan say tachanun if there was a siyyum or if there is going to be after aleinu? Or, is it preferable to have a Siyum on Shabbat (just for example) to avoid this safeik? Is Tachanun recited ...