I've done a handful of these quick trips and it's really great in the middle of the summer when the days are long. I've gone as late as the first week in November and the weather has been okay. If going in the fall, I would plan on one course (or two at the same location) a day and limit driving due to the lack of daylight.
Also check the weekend visitor policies. I made a quick trip in June arriving in Shannon on Thursday morning. Unfortunately my clubs didn't join me until Saturday morning. One of the dangers of such a short trip.