Volunteering for events where there is free-mixing and designing a poster with a logo containing small shadow of a woman

(1) Is it permissible to volunteer as an event coordinator for the branch of IEEE WIE(Women In Engineering) in our university? There is free-mixing and the instructor of the workshops may be male or female. IEEE WIE promotes career for women in engineering. Note that I am a boy. References are needed from Quraan or Hadeeth. (2) Is it permissible to design a poster for an event with the logo of this group which contains a shadow of a woman in the character W? Shadow means only a color, not like real image, and there are shadows of an eye lid, nose, and hair. The logo will remain such small that it is usually not noticed...