When we know a FA is coming we ask our members to report how many workshops and T1 sets they will be building. About 70% respond, which is, in itself, a good measure of enthusiasm. Then we enter their numbers into our spreadsheet and and "enthusiasm" score (based upon the data of the last 3-4 FA's which tells us how many badges they produced and a bit more). From this the spreadsheet will tell us our probable minimum score, our possible maximum score, and our most likely score. AND then it tells us where we are likely to finish in the rankings for the FA given the general increase in scores across the last 4 FA's (we chart the top 30 fellowships). All of which gives us the ability to predict where we will end up and THAT becomes our goal. We then set the paths and the spreadsheet tells us how many of this or that we need. We know from our data where we "failed" the last 3 times (because we know the total of each type of badges we need before we start and the number of those actually made) and thus we can adjust the paths to cover those weaknesses. Thus we can shape our experience to our abilities and do pretty well.
In the end we find having a goal we can reach and advertising that goal before we start, along with knowing what will be needed, makes the whole thing much less stressful and fun. We even have "Pit Party's" where we try to make the whirlpool spin as fast as we can.
All of which is to say, in my opinion, planning is everything in the FA's.
AJ