If you have a smart phone (Android or iOS), you can ride Peak Audax events with an eBrevet. This saves you all the trouble of collecting receipts from shops, cafes, or petrol stations. It may ease your anxieties about your Garmin batteries giving out.
You don’t even need to keep your phone on during the ride if you are worried about battery life; your phone only needs to be on (with location services turned on) at each control. You only need mobile data or access to WiFi when you download the eBrevet before the ride and to upload your completed eBrevet after the ride.
A completed eBrevet
There is also the facility to customise your Perm ride. You can often reverse the direction of the ride, start at a different control, or specify your own start place. Or indeed any combination of these. You cannot customise a Calendar Event.
E-Brevet Instructions