Me again (I'm not stalking you, honest) - I noticed when searching that the Edinburgh Belles on Bikes did the cycletta last year
https://cycling.hasacalendar.co.uk/event/3-edinburgh-belles-at-cycletta-perth/
So it's possible they may be doing it again this year (
@Telemark would know), though quite a change in the date from October to July?!? Must be weather determined!!
The 100k route looks similar (if not the same) to the Highland Perthshire Challenge ride a few of us did last year - nice quiet roads, though a bit of a headwind!