It's not quite double the distance for me to get up to Cottonwood Falls or Council Grove, but that's not the end of the world.
Swope park in Cottonwood Falls has RV facilities ($15/day) and a community room ($75/day), and tent camping at Bates Grove Park (located North of the river bridge). I didn't see a cost on the tent camping.
http://cwfks.org/parks-and-recreation/There appear to be three motels in Cottonwood Falls: Millstream Resort Motel, The Lark Inn on Main Guesthouse, and Grand Central Hotel & Grill. All are about 3-4 blocks from Swope park.
Council Grove has ample camping at the lake, both tent and RV. I see only one motel in town, though. the Prarie Lodge Motel.
I'm not sure what kind of meeting location might be available.