Basically, just edit the calendar link out of header.tpl in the templates/default directory then don't enable the calendar islands and it'll basically stay hidden. you can ensure it's closed to everyone (but admins) by editing the script/calendar file and setting the admin line to 1 from 0

I am a Web Development Contractor, I do not work for UBBCentral. I have provided free User to User Support since the beginning of these support forums.
Do you need Forum Install or Upgrade Services?
Forums: A Gardeners Forum, Scouters World
UBB.threads: UBBWiki, UBB Styles, UBB.Sitemaps
Longtime Supporter & Resident Post-A-Holic
VNC Web Services: Code Modifications, Upgrades, Styling, Coding Services, Disaster Recovery, and more!