All institutions, by their very nature, contain a finite amount of knowledge representing the communal skills and learning of their employees. Well funded institutions who find skills or knowledge lacking hire more employees or outside consultants. Many K-12 entities lack the financial resources to exercise this option. That is why it is vitally important for local communities to participate in K-12 education either through on-campus interactions, or by offering opportunities in their own spaces.
Universities, with an abundance of professional educators, students, and meeting spaces, are perfectly positioned to offer enrichment to the K-12 community. Two examples that come to mind are the University of Colorado Boulder (CU) Wizards program: HERE and The Rockefeller University Science Saturday: HERE
Both offer incredible learning opportunities to young learners by carefully crafting how to present complicated topics to this audience.
The Boulder Center for Interactive Learning at Dawson (BCILD) hopes to learn about, and share, information on other such opportunities within K-12 communities.