Modern Hagiography
Lives of the Saints by Sabine Baring-Gould.
Medieval Hagiography
Art & Architecture
Warburg Institute Iconographic Database
Post-Biblical Saints Art Index
The Saints in Art by Joseph Maria von Radowitz.
Emblems of Saints by Which They Are Distinguished in Works of Art by F. C. Husenbeth.
Devotions
Saint Narcis Fair and Festival (but celebrated in October, see also)
Nihil sub sole novum 