Hard to think beyond PBP, but since by then [all being well] I will have 3/4 of a Hyper-Randonneur series, I thought about another 600 in the normal early Autumn slot for the Flatlands...Not just for wannabe 'Hypers', but a good time to complete an SR with your summer fitness.
I'm not sure if I can take yet another Fenland crossing this year, so maybe a diy from Essex westwards, otherwise a route based on the Asparagus and Strawberries 400, with a second day of 200km on one of my perm. routes? That would open up the possibility of booking the church hall for a sleepover Saturday night [or more likely early Sunday], also for the Friday night before, if there are enough interested. Cost in the region of £5-10 each probably, if not so many then there's floor/sofa space at mine.
Happy to ride 'full value' with first-timers.