For the larger, one-day events, (basically happening monthly) I like the idea of having a similar event flier design with slightly different features based on the neighborhood, time of year, etc.
Modern graphic design #calendar cards
2015 calendar colors by dozi
Design Calendar | Annkathrin Dahlhaus Good example of type as graphic. Clear and easy to use structure, but with enough typographic variation to keep layouts different. Minimal color scheme highlights type as graphic elements, creating patterns similar in some ways to the cover.