Hi Nathan, it’s pretty informal, no specific signup. There’s a WhatsApp group TDU2024, Steve garland can add you to this. It’s used to arrange rides and general communication.
Re accommodation some stay at the caravan park or cabins at Brighton, some stay in or near the city, there is one shared house (housos) – not sure where it is this year, suggest posting on the WhatsApp group if you are looking for a spare room.
We usually get together as the full group a couple of times during the week.
Just to add to Richard’s response the TDU runs from the 12-21 January (not Feb) with most people heading over on the Friday/Saturday. That said I think Steve G and some of the guys will be there
earlier and some jump a plane mid week.
A number of us are staying in the Brighton Beachfront Holiday Park south of Glenelg while others stay in the city (YHA, hotels) or North Adelaide. As Richard suggests, drop Steve a note to get added to the WhatsApp group in case there is some shared accomodation and of course for daily ride planning (things change hourly so WhatsApp has become the defect comms channel for the TDU rather than the ARC Forum here).