Teach Democracy (formerly Constitutional Rights Foundation)
The 46th annual California Mock Trial Competition: high-school teams argue a fictional case in county competitions, with county champions advancing to the state finals.
Capital University — Junior Science and Humanities Symposium (JSHS)
The Ohio regional Junior Science and Humanities Symposium, hosted by Capital University: high school students present original STEM research and compete for scholarships and recognition; no cost to register or take part.
The fourth Yale Model UN conference in Singapore, run by Yale students: three days of committee debate with workshops and speaker sessions for secondary and JC students.
A free international essay competition for students aged 11–18, run by the independent organisation Oxford Global Education, with a live oral defence final.
The Sacramento Regional STEM Fair, a regional science and engineering fair for twelve Sacramento-region counties students affiliated with the California Science & Engineering Fair (CSEF) and Regeneron ISEF.
Minnesota DECA's 2027 state conference where high school members compete in business and marketing competitive events (marketing, finance, hospitality, management and entrepreneurship) and attend leadership workshops; top finishers can qualify for the DECA national conference.
University of Maine — Junior Science and Humanities Symposium (JSHS)
The New England Northern regional Junior Science and Humanities Symposium, hosted by University of Maine: high school students present original STEM research and compete for scholarships and recognition; no cost to register or take part.
Orange County Science and Engineering Fair (OCSEF)
The Orange County Science & Engineering Fair, a regional science and engineering fair for Orange County students affiliated with the California Science & Engineering Fair (CSEF) and Regeneron ISEF.