[Avodah] onen erev pesach

[Danny Schoemann]

R' Eli Turkel <eliturkel at gmail.com> asked:
> His father died the evening before Pesach and the funeral was in the
> afternoon and so sat shiva only for a short time.
>
> He is also a bechor and the question was whether he had to fast,
> with/without a siyum?

The KSA in  212:1 says that during the entire Shloshim an Aveil may
not eat at a Seudat Mitzva, including a Siyum, unless it's being made
in his home.

The question then becomes more general: Can any Aveil during Shloshim
eat after hearing the Siyum in Shul? After all, he cannot eat at that
Siyum.

- Danny, also a Bechor