A good question.
A local answer.

Check the forecast shortly before departure and bring a compact rain layer if showers are expected. You need not pack for every season in a single day.

Choose the region first: McLaren Vale, Barossa and the Adelaide Hills make different days. Then compare pickup point, group size, cellar-door time and whether lunch and tastings are included.

If the flight cannot change, arrange transport in advance and keep travel documents ready. A prebooked ride helps, but it cannot recover a delayed ship.

Plan d'Arenberg plus one or two nearby stops, with a lunch reservation between tastings. Driving and lingering outdoors take longer than a map of cellar doors suggests.

Choose a self-drive day only if someone is content to be the designated driver. Compare a small-group tour's pickup, group size and included tasting fees before assuming it will feel impersonal.

Map the direct drive first, then select a wine region that does not force a long backtrack. Book lunch and tasting appointments around your intended arrival time.

Group North Terrace sights together and give Glenelg or Hahndorf its own half-day. That avoids spending the week moving between distant stops.

Look around the CBD and North Terrace for a broad choice of restaurants and straightforward access to the Oval. Check the exact apartment's walk after the match, not just its suburb label.

Bring water, sun protection and shoes comfortable on paved paths and sand. If the weather turns, shorten the walk at a transport stop instead of pressing on to the end.

A rideshare quote may look cheaper, but availability of a suitable child seat is the deciding factor. Do not assume every driver carries one.

If visiting the market is essential, move that activity to a confirmed trading day and allow time to browse and eat. Do not build a three-day itinerary from an old forum timetable.

For a larger trip, book any sport or performance seats together early. Keep a rest day and a wet-weather option rather than filling all eight days in advance.