It was just that particular panel was male dominated in more ways than one.
If you look at the photos from the event many panels were much more balanced: http://www.worldsciencefestival.com/signing-off-10th-anniversary-world-science-festival/
If you scroll to the bottom and click the View All button, you get a slideshow of the photos with captions
In addition, there was a panel of all women space scientists called "Hidden Figures No More! Heroines of Space Science Past, Present, and Future."
There was also "Nevertheless, She Persisted: A Spotlight on Women in Science" with another all female panel.
The poster with the woman running was for "Flame Challenge: What is Energy?" which is sponsored by Alan Alda:
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Alan Alda has issued this years challenge to the worlds top scientists: What is energy? In an action-packed hour of interactive demonstrations, Alan and a team of experts invite the audience to explore how our bodies use energy, the impact of natural resources, and how were going to power the world in the future. The program also highlights the winners of the 2017 Flame Challenge, in which video and written explanations of energy were judged for claritys sake
by 20,000 eleven year-olds.
This program is in association with the Flame Challenge, an annual contest held by The Alan Alda Center for Communicating Science at Stony Brook University.
http://www.worldsciencefestival.com/programs/flame-challenge-energy/
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One of the demonstrations on how the body used energy was a runner on a treadmill (starts about 48:00):