diff --git a/src/Foundation.hs b/src/Foundation.hs
index 284fe8ae1..30498f0f3 100644
--- a/src/Foundation.hs
+++ b/src/Foundation.hs
@@ -1977,6 +1977,8 @@ siteLayout' headingOverride widget = do
   --             isParent r = r == (fst parents)
 
   isAuth <- isJust <$> maybeAuthId
+  
+  now <- liftIO getCurrentTime
 
   -- Lookup Favourites & Theme if possible
   (favourites', maxFavouriteTerms, currentTheme) <- do
@@ -2021,7 +2023,14 @@ siteLayout' headingOverride widget = do
             
         E.where_ $ ((isFavourite E.||. isAssociated) E.&&. notBlacklist) E.||. isCurrent
 
-        return (course, reason)
+        E.where_ $ (E.isJust (course E.^. CourseVisibleFrom)
+          E.&&. course E.^. CourseVisibleFrom E.<=. E.val (Just now)
+          E.&&. (E.isNothing (course E.^. CourseVisibleTo)
+                 E.||. E.val (Just now) E.<=. course E.^. CourseVisibleTo
+                )
+          ) E.||. isAssociated
+
+        return (course, reason, isLecturer)
 
       return ( favCourses
              , maybe userDefaultMaxFavouriteTerms userMaxFavouriteTerms $ view _2 <$> muid
@@ -2029,9 +2038,9 @@ siteLayout' headingOverride widget = do
              )
 
   let favouriteTerms :: [TermIdentifier]
-      favouriteTerms = take maxFavouriteTerms . Set.toDescList $ foldMap (\(Entity _ Course{..}, _) -> Set.singleton $ unTermKey courseTerm) favourites'
+      favouriteTerms = take maxFavouriteTerms . Set.toDescList $ foldMap (\(Entity _ Course{..}, _, _) -> Set.singleton $ unTermKey courseTerm) favourites'
   
-  favourites <- fmap catMaybes . forM favourites' $ \(Entity cId c@Course{..}, E.Value mFavourite)
+  favourites <- fmap catMaybes . forM favourites' $ \(Entity cId c@Course{..}, E.Value mFavourite, E.Value isLecturer)
       -> let courseRoute = CourseR courseTerm courseSchool courseShorthand CShowR
              favouriteReason = fromMaybe FavouriteCurrent mFavourite
          in runMaybeT . guardOnM (unTermKey courseTerm `elem` favouriteTerms) . lift $ do
@@ -2053,7 +2062,7 @@ siteLayout' headingOverride widget = do
                   $logDebugS "FavouriteQuickActions" $ tshow cK <> " Done."
                   return items
               $logDebugS "FavouriteQuickActions" $ tshow cK <> " returning " <> tshow (is _Just items)
-              return (c, courseRoute, items, favouriteReason)
+              return (c, courseRoute, items, favouriteReason, isLecturer)
 
   nav'' <- mconcat <$> sequence
     [ defaultLinks
@@ -2085,10 +2094,10 @@ siteLayout' headingOverride widget = do
               navItems = map (view _2) favourites ++ toListOf (folded . typesUsing @NavChildren @NavLink . to urlRoute) nav
               highR  = find (`elem` navItems) . uncurry (++) $ partition (`elem` map (view _2) favourites) crumbs
       highlightNav = (||) <$> navForceActive <*> highlight
-      favouriteTermReason :: TermIdentifier -> FavouriteReason -> [(Course, Route UniWorX, Maybe [(Text, Text)], FavouriteReason)]
+      favouriteTermReason :: TermIdentifier -> FavouriteReason -> [(Course, Route UniWorX, Maybe [(Text, Text)], FavouriteReason, Bool)]
       favouriteTermReason tid favReason' = favourites
-        & filter (\(Course{..}, _, _, favReason) -> unTermKey courseTerm == tid && favReason == favReason')
-        & sortOn (\(Course{..}, _, _, _) -> courseName)
+        & filter (\(Course{..}, _, _, favReason, _) -> unTermKey courseTerm == tid && favReason == favReason')
+        & sortOn (\(Course{..}, _, _, _, _) -> courseName)
 
       -- We break up the default layout into two components:
       -- default-layout is the contents of the body tag, and
@@ -2187,7 +2196,9 @@ siteLayout' headingOverride widget = do
               isNavHeaderSecondary = has $ _1 . _navHeaderRole . only NavHeaderSecondary
       asidenav :: Widget
       asidenav = $(widgetFile "widgets/asidenav/asidenav")
-        where logo = preEscapedToMarkup $ decodeUtf8 $(embedFile "assets/lmu/logo.svg")
+        where
+          logo = preEscapedToMarkup $ decodeUtf8 $(embedFile "assets/lmu/logo.svg")
+          courseIsVisible Course{courseVisibleFrom,courseVisibleTo} = NTop courseVisibleFrom <= NTop (Just now) && NTop (Just now) <= NTop courseVisibleTo
       footer :: Widget
       footer = $(widgetFile "widgets/footer/footer")
         where isNavFooter = has $ _1 . _NavFooter
diff --git a/templates/widgets/asidenav/asidenav.hamlet b/templates/widgets/asidenav/asidenav.hamlet
index c27bd7696..d765c5b66 100644
--- a/templates/widgets/asidenav/asidenav.hamlet
+++ b/templates/widgets/asidenav/asidenav.hamlet
@@ -21,11 +21,14 @@ $newline never
             <h3 .asidenav__box-subtitle>
               _{favReason}
             <ul .asidenav__list.list--iconless>
-              $forall (Course{courseShorthand, courseName}, courseRoute, mPageActions, _) <- favouriteTermReason tid favReason
+              $forall (course@Course{courseShorthand, courseName}, courseRoute, mPageActions, _, isLecturer) <- favouriteTermReason tid favReason
                 <li .asidenav__list-item :highlight courseRoute:.asidenav__list-item--active>
                   <a .asidenav__link-wrapper href=@{courseRoute}>
                     <div .asidenav__link-shorthand>#{courseShorthand}
-                    <div .asidenav__link-label>#{courseName}
+                    <div .asidenav__link-label>
+                      #{courseName}
+                      $if not (courseIsVisible course) && isLecturer
+                        \ #{iconInvisible}
                   <div .asidenav__nested-list-wrapper>
                     $maybe pageActions <- mPageActions
                       <ul .asidenav__nested-list.list--iconless>