Go here for guidance on how to use the open-source TimelineJS is tool that enables anyone to build visually rich, interactive timelines:
https://timeline.knightlab.com/#overview
TIPS:
Keep it short; 20 slides tops.
Pick stories that have a strong chronological narrative.
Write each event as a part of a larger narrative.
Include events about homelessness or being under-housed that build up to major occurrences — not just the major events.
There's a great example here by Charles Graham of Baltimore, MD. http://ow.ly/JGsc30gaPe8