So......
As I understand it, the Zep-led (see what I did there) SM massive (about 10) will convene at Riverside, and then arrive at Sywell at 8.30.
Meanwhile, the Facebook crew (about 5-35) will meet at J15a, and then arrive at Sywell at 8.30. (Assuming they don't all get lost looking for Cobham services 10 miles away near Chobham.)
And then, presumably, the marshals will mingle both groups together and see what happens.
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By the way, the 'maserati owners uk' Facebook group looks quite interesting, despite its extraordinary ideas about capitalisation.