I recognize that skin..
Everything you need is located inside your navbar template. These are controlled in the <li> element.
eg: <li>
<a href="goes somehwre">A title</a>
</li>
So to move Calendar into community look for this
Code:
<li><a href="calendar.php{vb:raw session.sessionurl_q}">{vb:rawphrase calendar}</a></li>
Copy and delete.
Now it depends where you want it, I've put mine before member list.
Code:
<vb:if condition="$show['memberslist']">
<li><a href="memberlist.php{vb:raw session.sessionurl_q}">{vb:rawphrase members_list}</a></li>
</vb:if>
paste your recent copy above it.
You should get this result
I've not moved this bit {vb:raw template_hook.navbar_after_calendar} <lol> perhaps an advisor can point that out