Henry IV, Pt. 1 may not be Shakespeare's most well known history, but it is such a rich and deep text without which a complete understanding of Shakespeare's canon is impossible. It's enlivened by some of the themes that are most important to Shakespeare: philosophy, theology, cosmology, and, of course, the nature of love and fidelity. Plus it's replete with some of Shakespeare's most pleasing, clever lines, scenes, characters, and plot twists.
In short, it's the perfect Great Book to read in community: to argue about and celebrate and revel in. It's the perfect play for the CiRCE Summer Institute.