Blink roller ski festival:

http://www.blinkfestivalen.no/home

women's roller ski sprint from last year -- watch the double poling at 3:15 of this video:

Men's roller-ski pursuit highlights



A great series of training & technique videos

https://www.ski-lines.com/articles/21488-sprinting-with-roman-schaad

https://www.ski-lines.com/articles/21324-double-pole-sprints-with-pellegrino

https://www.ski-lines.com/articles/21245-double-pole-technique-with-stian-hoelgaard-of-team-leaseplan

https://www.ski-lines.com/articles/20871-team-leaseplan-sprint-training

https://www.ski-lines.com/articles/20849-strength-training-with-team-leasplan