The allstar week is an organisational challenge which the great majority of teams will fail. Unless you are still in the cup (which persents its own challenge 16 teams left, 8 will have 2 competitive games, 8 will have three but they wont know until Tuesday night) you will have a game on Saturday and a scrimmage on Thursday.
Most people change their training this week, if they normally train for example pressure for PGs with three trainees this week they switch to JS for guards and a 4th trainee gets some training. Most teams make this a week to train stamina or free throws although I think the playoffs are a better time to do that so that you don't have to worry about training lineups.
In terms of game shape, in theory you can get 10 guys all 48 minutes, but more sensibly you can ensure at least all your starters are getting 48-70 minutes and just accept that your reserves will suffer a little.
One way to maximise game shape and training (in this example training JS for guards) is just play 8 players in the game, a starter and backup at SF, PF and C but just one PF and SG. If everything goes well you will have two guys with full training minutes. In the scrimmage do the same. At the end of the week you will have 4 guys trained and getting 48+ minutes each, your starting SF, PF and C will all have good minutes and overall 7 players should be fine, 3 a little bad and the rest horrible.