Add in some mix of the following as activities that add piety:
- Using bard song
- Being affected by bard song (i.e. being a patron of the arts)
- Use of craft wand/scribe scroll/brew potion
- Casting of spells from any items (I want this to capture wands/scrolls and casting from the wizard spellbooks)
- Successfully identifying an item
- Successfully understanding a line of text that's in a language you aren't yet fluent in