Per Chabad.org: "Traditionally, families gather on the eve of the Shloshim to share support, recite prayers and Psalms, and to give charity in the merit of the deceased. Many will also make a Siyum, celebrating the completion of the Mishnayot studied to merit the soul of the deceased, as well as a meal."
When is the proper day and time for a Shloshim Seuda? Are there differing minhagim in this regard?