Calendar events are not set in stone.  The events are subject to change due to weather or other unforeseen issues.  If you have been disappointed by missed events because they changed the dates you are not alone.  In todays busy environment we all must plan our time to coincide with events.  When an event changes date our planning goes out the window.  It is best to plan for these changes as you can and not let it get you down.  The best plan is often no plan at all.  Although these community calendars are a good thing to look at for events the timing should be taken with a grain of salt.  Ken Fisher can attest to the calendar changes.