The goal is to have 50,000 indexers and arbitrators submit at least one batch of indexed records in the 24-hour period.
In addition, DearMYRTLE is hosting a Google+ Hangout On Air called a GeneaSleepOver in order to support this event. See DearMYRTLE's GeneaSleepOver: woirldwide Indexing Project.
Read DearMYRTLE's blog post that describes it. Prepare for it by reading DearMYRTLE's Prepping for the GeneaSleepOver post also.
To participate in the Indexing Project and the GeneaSleepOver, DearMYRTLE suggests: