When is it prescribed to raise one’s hands in supplication (Du’a), especially during Friday and Eid sermons, after burial in the graveyard, after the prescribed prayers, and at weddings?

It is permissible to raise the hands during any supplication (Du'a), except for the Imam's supplication during the Friday sermon. This permissibility includes raising them when supplicating for the deceased to be firm [during questioning in the grave] at the time of burial, and when the marriage officiant supplicates for the bride and groom. It should be noted that Allah may accept supplications without raising the hands, but raising them demonstrates humility, submissiveness, and neediness before Allah.