Briefly pondered about something similar the other evening. I sometimes fantasize about an urban cross country race along my various door step routes. It would be a test of basic skills (influenced by trials, getting up and over small obstacles, skinnies, low speed handling skills, very tight turns requiring pivots etc), cross country skills preventing riders from taking easy/smooth/straight lines, and urban stair sets and other obstacles, small drops etc. There’s no big climbs or descents, the cross-country aspect is all farm tracks apart from very short singletrack in scraps of urban woodlands. I’d love to see something like that happening near me but the amount of work it would take getting permissions, would be I suspect extremely challenging/unlikely. Also it appears all the people that might be able to take part would rather ride elsewhere!