Here is my entry to the Shiny contest. Using data from the Bureau of Labor Statistics, I mapped US strike data from 1993-2017. This app is partially designed to show how different htmlwidgets can interact with each other in a Shiny application. I used Dean Attali's 'timevis' package, 'Leaflet', and a 'Echarts4R'
You can interact with the timeline by zooming in and out and dragging, and when you select an item in the timeline, the map will zoom to the location of the strike. You can also select on a marker on the map and the map will zoom as well, and the timeline will adjust to show the corresponding strike event.
NOTE: For some reason it doesn't seem to run well in Chrome, but it works in Microsoft Edge and may work in other browsers.
You can see the app here:
https://esbriskin.shinyapps.io/Strikes/
You can see the code on RStudio cloud here:
https://rstudio.cloud/project/194425
The files I used are also available here - I did some pre-loading as I needed to geocode the areas and I didn't want that to be in the script of the Shiny app.