When there have been Footy Extra trains to Adelaide Oval, AdMet have run 5 extra sets, intersperced with the regular timetabled Seaford runs. Usually these extras have been EMUs, but have only done "in and out" trips, leaving the all-day roster to DEMUs.
Today was different in that EMUs were deployed onto 3 out of 4 of the all-day rosters, so electrics were running up and down all day and into the evening. 2 of the 5 Footy Extra pre-game runs were 3-car 3000-class, the other 3 were EMUs.
Maybe this was to cater for extra weekend Show crowds, or maybe there has been a change of thinking and we will see 4000-class EMUs working most/all of weekend services in the future.