Final answer:
Beowulf, Hrothgar, and their people celebrate their alliance by drinking mead, listening to music, and socializing in Heorot, reflecting Germanic cultural traditions.
Step-by-step explanation:
Beowulf, Hrothgar, and all their people celebrate the alliance between the Geats and the Danes by drinking mead, listening to the minstrel, and hanging out in Heorot. This form of celebration reflects the Germanic social practices where festivity and the sharing of spoils often followed victories or alliances. The Meade Hall, as symbolized by Heorot, served as a central location for such gatherings, highlighting the cultural importance of communal bonding and celebration in the form of feasts and storytelling within Germanic tribes.