Do you clean useless calendars in SharePoint?
  v3.0 Posted at 10/12/2015 10:13 AM by Ulysses Maclaren
Most SharePoint site templates contain a calendar list, this will bring lots of useless calendars.

​Use the below PowerShell script to clean them:​​

$site = Get-SPSite("http://<site collection URL>/"); # Specify url here​
​foreach ($web in $site.AllWebs) {    ​
    $lists = $web.Lists
    for ($i=($lists.Count-1);$i -gt 0; $i--) {  
        $list = $lists[$i]
        #Write-host $i  $list.Title $list.BaseTemplate.ToString()
        if ($list.BaseTemplate.ToString().ToLower().contains('events')) {      
            if ($list.Items.Count -eq 0)
                Write-Host $list.Items.Count "items in the list" $list.Title '('$list.BaseTemplate') at '$web.Url "- cleaning it!"
}  ​

This script will put the calendars which do not have any events into Site SettingsRecycle Bin:

​Figure: Empty Calendars in Recycle Bin folder

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