Re: friendly match with cavaliers cp_pro_granary download, uncompress and copy to maps folder of your TF2 installation
Re: friendly match with cavaliers yes, the "old" one. more skill based (scout rushes) and the medic HAS NOT UBERCHARGE when the gates open. So make sure to get him, he'll have like 60% when he's in the middle.
Re: friendly match with cavaliers pretty much yes. Watch out, play hide and seek, dont kill yourself. edit: also the times, watch it http://www.timeanddate.com/worldclock/ The CAV match starts at 19:30 GMT/20:30 BST/21:30 CET, if the CET time from Rev is correct