Not always but as with Fed meetings a change in trend is possible or the stopping of a trend (Feb 20) occurs after the Fed minutes.  3/8 Fed Minutes per year are significant. So as with May 2013, a possible change in VIX trend could occur due to Fed Policy change after Fed Minutes May 20.

If 2 days after the Fed minutes SPY turns red, then VIX will most likely rise from there.  If SPY is green then chances are VIX remains low or falls then the next opportunity would be Jun 17 Fed Meeting.

The Minutes below are on Feb 19 and Apr 8. See Feb 20 where SPY peaked out and Apr 9 where there was no significant event and the trend continued. In the case of May 2013 in the previous post, May 22 or the day after minutes SPY turned red.