iGEM (synthetic biology)

Build something living. The world's synthetic-biology competition, with a division made for school teams.

Who can enter: High-school and university teams worldwide — see the High School division
What it costs: Expensive and team-based: registration runs into thousands of dollars per team, plus lab costs and travel to the Jamboree. Teams raise sponsorship for it — this is not a solo entry you can self-fund.
When it closes: We could not confirm this year's date against the organiser's own page, so we are not showing a countdown for it. Last published: Teams form through the spring; the Grand Jamboree is in the autumn.

Sending this to someone sends the four facts above, not just a name — they will see who can enter and what it costs before they decide.