This is a simple mass invite script that is activated when you right click and select "-=Mass Invite=-" on the channel you are inviting from.

menu channel {
  -=Mass Invite=-: { set %minvitechan $$?=" What room do you want to mass invite to? " 
    if (!$chan) || (!%minvitechan) { 
      echo -a * /minvite Insufficient Parameters. Please try again
    }
    elseif ($me !ison $chan) || ($me !ison %minvitechan) { 
      echo -a * /minvite ERROR You need to be in the specified channels
    }
    else {
      var %x 1 | while (%x <= $nick($chan,0)) { var %n $addtok(%n,$nick($chan,%x),46)) | inc %x
      }
      echo -a * /minvite Initiating Mass Invite...
      part $chan
      var %m 1 | while (%m <= $numtok(%n,46)) {
        .timer $+ %m 1 %m invite $nick($chan,%m) %minvitechan | inc %m
        .timer 1 30 unset %minvitechan
      }
    }
  }
}