Sept. 14: 326
Sept. 21: 200
Total North Line: 526
Sept. 14: 1,356
Sept. 21: 1,354
Total South Line: 2,710
Total boardings, all trains both days: 3,236
For comparison, an average August full weekday of Sounder draws over 11,000 boardings. You can find the schedule for the special service here. It consisted of six round trips to Lakewood and three to Seattle, one of which extended to Everett. Some of this service was not particularly useful for the fair, instead maintaining Sounder’s quite rider-friendly practice of making almost all runs revenue runs just in case someone needs to make a trip. I won’t claim to really understand attendance patterns at the fair, but I’d estimate that five Lakewood round trips and 1.5 Seattle round trips were actually useful to people attending the fair.
ST spokesperson Kimberly Reason says no ST funds were used to provide this service. It instead came from the Washington State Fair and Events Center, so it’s ultimately up to them if this is value for the money and whether they increase, maintain, or reduce service next year. The Center didn’t respond to my inquiry about their plans.