What is the extent of the "worldwide campaign" to observe near-earth object 2012 TC4?
The JPL press release mentions that more than 12 observatories, labs and universities will be involved but doesn't mention which.
https://www.jpl.nasa.gov/news/news.php?feature=6906


The University of Maryland has a website on the 2017 apparition of 2012 TC4
http://2012tc4.astro.umd.edu/index.shtml
Here's a snapshot of the list of planned observations shown there