In the past Google updated their index roughly once a month. Those updates were named Google Dances, but since Google shifted to a constantly updating index, Google no longer does what was traditionally called a Google Dance.
Major search indexes are constantly updating. Google refers to this continuous refresh as everflux.
The second meaning of Google Dance is a yearly party at Google’s corporate headquarters which Google holds for search engine marketers. This party coincides with the San Jose Search Engine Strategies conference.
- Matt Cutts Google Terminology Video – Matt talks about the history of Google Updates and the shift from Google Dances to everflux.