If it's the first Saturday of the month, then it's this coming Saturday, 7 Jan. I work until 3pm on Saturdays, so I don't think I'll be able to check it out, on this much of a short notice - especially after busting out of work last week, for most of a week.
If anyone local can check it out, lemme know. It's off Hwy 74 towards the lake. West on 74 off the I-17. This does NOT appear to be the Ben Avery facility.