I'm the most Kkkrackkkers of Amerikkkans so my tradition is just getting drunk off mulled wine and re-watching bad holiday movies with relatives I only kinda like.
I'm sometimes a little jealous of people who have weirder shit going on, like gremlins who slam doors and steal sausages or shitting Christmas logs. We need to bring back weird ass half-pagan shit.
Summer Christmas and Dezemba (slang for December holidays, it's the longest holiday break) parties everywhere. Pool parties, lots of braais/grilling/BBQ, party music and atmosphere everywhere. Lots of drinking.