Terry...Don't know that that is "always" the case. I think most public corporations schedule annual shareholders meetings as a matter of good business practice.
For instance, this Orchid PR from February announcing the R/S approval notes the upcoming annual shareholders meeting scheduled for June 11, 2004. They didn't need to file with the SEC to make that announcement:
..."As a result of the approval obtained today, Orchid's Board of Directors has discretionary authority to implement a reverse stock split ranging from 1-for-3 shares to 1-for-7 shares at any time prior to the Company's Annual Meeting of Shareholders, which is scheduled to be held on June 11, 2004..."