I did contact the Bowhill general store who advised me that whilst they were open this weekend there will be a wakeboarding competition in town and they expect to be chokkas, so I decided to leave that venue for another day. I then contacted the Walker Flat Café and put in a booking for six, usual time of 1230.
5080 Angas Valley Rd, Walker Flat SA 5238
I'd edit the top post but I don't have the permissions to do that.