diff --git a/judge/templates/judge/contest_detail.html b/judge/templates/judge/contest_detail.html
index 348eb38..25ac45f 100644
--- a/judge/templates/judge/contest_detail.html
+++ b/judge/templates/judge/contest_detail.html
@@ -26,7 +26,8 @@ <h2 class="d-inline">{{ contest.name }}</h2>
 <div class="row">
     <div class="col-12">
         {% if type == 'Poster' %}
-        <a class="btn btn-primary" href="{% url 'judge:new_problem' contest.pk %}">Add Problem</a>
+        {% if now < contest.start_datetime %}<a class="btn btn-primary"
+            href="{% url 'judge:new_problem' contest.pk %}">Add Problem</a>{% endif %}
         <a class="btn btn-primary" href="{% url 'judge:contest_scores_csv' contest.pk %}">Download Scores</a>
         {% endif %}
         <a class="btn btn-primary" href="{% url 'judge:get_posters' contest.pk %}">See posters</a>
diff --git a/judge/templates/judge/problem_detail.html b/judge/templates/judge/problem_detail.html
index eb843ad..8ec41f5 100644
--- a/judge/templates/judge/problem_detail.html
+++ b/judge/templates/judge/problem_detail.html
@@ -118,10 +118,12 @@ <h4 class="d-inline mx-2">{{ problem.name }}</h4>
             <a href="{% url 'judge:edit_problem' problem.pk %}" class="btn btn-primary">
                 <i class="fas fa-edit"></i>
             </a>
+            {% if now < problem.contest.start_datetime %}
             <form class="d-inline" action="{% url 'judge:delete_problem' problem.pk %}" method="POST">
                 {% csrf_token %}
                 <button type="submit" class="btn btn-danger"><i class="fas fa-trash"></i></button>
             </form>
+            {% endif %}
         </div>
         {% endif %}
     </div>
@@ -167,7 +169,7 @@ <h4>Output Format</h4>
         <h4>Public test cases</h4>
         {% for test in public_tests %}
         <h5 class="d-inline">Test Case {{ forloop.counter }}</h5>
-        {% if type == 'Poster' %}
+        {% if type == 'Poster' and now < problem.contest.start_datetime %}
         <div class="d-inline">
             <form class="d-inline" action="{% url 'judge:delete_testcase' problem.pk test.2 %}" method="POST">
                 {% csrf_token %}
@@ -198,12 +200,14 @@ <h6>Output</h6>
         <h4>Private test cases</h4>
         {% for test in private_tests %}
         <h5 class="d-inline">Test Case {{ forloop.counter }}</h5>
+        {% if now < problem.contest.start_datetime %}
         <div class="d-inline">
             <form class="d-inline" action="{% url 'judge:delete_testcase' problem.pk test.2 %}" method="POST">
                 {% csrf_token %}
                 <button type="submit" class="btn btn-danger"><i class="fas fa-trash"></i></button>
             </form>
         </div>
+        {% endif %}
         <div class="col-12">
             <h6>Input</h6>
             <div class="zero-clipboard">
@@ -298,9 +302,9 @@ <h3>Submit Solution</h3>
 </div>
 {% endif %}
 
-<!-- TODO Restrict to poster only (check views) -->
 {% if type == 'Poster' %}
 <div class="row">
+    {% if now < problem.contest.start_datetime %}
     <div class="col-12 my-4">
         <div class="card">
             <div class="card-header">
@@ -336,6 +340,7 @@ <h3>Add Test Case</h3>
             </div>
         </div>
     </div>
+    {% endif %}
     <div class="col-12">
         <a href="{% url 'judge:problem_submissions' problem.pk %}" class="btn btn-default">See all solutions</a>
     </div>
diff --git a/judge/views.py b/judge/views.py
index 31edfe5..e0a641a 100644
--- a/judge/views.py
+++ b/judge/views.py
@@ -203,6 +203,8 @@ def delete_problem(request, problem_id):
     contest_id = problem.contest.pk
     perm = handler.get_personproblem_permission(
         None if user is None else user.email, problem_id)
+    if timezone.now() > problem.contest.start_datetime:
+        return handler404(request)
     if perm and request.method == 'POST':
         status, _ = handler.delete_problem(problem_id)
         if status:
@@ -218,6 +220,8 @@ def delete_testcase(request, problem_id, testcase_id):
     perm = handler.get_personproblem_permission(
         None if user is None else user.email, problem_id)
     testcase = get_object_or_404(TestCase, pk=testcase_id)
+    if timezone.now() > testcase.problem.contest.start_datetime:
+        return handler404(request)
     if problem_id == testcase.problem.pk and perm and request.method == 'POST':
         status, _ = handler.delete_testcase(testcase_id)
         if status:
@@ -259,20 +263,23 @@ def problem_detail(request, problem_id):
             form = NewSubmissionForm()
         context['form'] = form
     if perm is True:
-        if request.method == 'POST':
-            form = AddTestCaseForm(request.POST, request.FILES)
-            if form.is_valid():
-                status, err = handler.process_testcase(
-                    problem_id,
-                    form.cleaned_data['test_type'] == 'public',
-                    form.cleaned_data['input_file'],
-                    form.cleaned_data['output_file'])
-                if status:
-                    redirect(reverse('judge:problem_submissions', args=(problem_id,)))
-                else:
-                    form.add_error(None, err)
+        if timezone.now() < problem.contest.start_datetime:
+            if request.method == 'POST':
+                form = AddTestCaseForm(request.POST, request.FILES)
+                if form.is_valid():
+                    status, err = handler.process_testcase(
+                        problem_id,
+                        form.cleaned_data['test_type'] == 'public',
+                        form.cleaned_data['input_file'],
+                        form.cleaned_data['output_file'])
+                    if status:
+                        redirect(reverse('judge:problem_submissions', args=(problem_id,)))
+                    else:
+                        form.add_error(None, err)
+            else:
+                form = AddTestCaseForm()
         else:
-            form = AddTestCaseForm()
+            form = None
         context['form'] = form
     context['public_tests'] = []
     context['private_tests'] = []
@@ -340,6 +347,8 @@ def new_problem(request, contest_id):
     if not (perm is True):
         return handler404(request)
     context = {'contest': contest}
+    if timezone.now() > contest.start_datetime:
+        return handler404(request)
     if request.method == 'POST':
         form = NewProblemForm(request.POST, request.FILES)
         if form.is_valid():
@@ -420,9 +429,9 @@ def problem_submissions(request, problem_id: str):
         form = NewCommentForm()
     submissions = {}
     if perm:
-        status, msg = handler.get_submissions(problem_id, None)
+        status, all_subs = handler.get_submissions(problem_id, None)
         if status:
-            for email, subs in msg.items():
+            for email, subs in all_subs.items():
                 status, comm = handler.get_comments(problem_id, email)
                 if not status:
                     logging.debug(comm)
@@ -430,19 +439,19 @@ def problem_submissions(request, problem_id: str):
                 submissions[email] = (subs, comm)
             context['submissions'] = submissions
         else:
-            logging.debug(msg)
+            logging.debug(all_subs)
             return handler404(request)
     elif user is not None:
-        status, msg = handler.get_submissions(problem_id, user.email)
+        status, subs = handler.get_submissions(problem_id, user.email)
         if status:
             context['participant'] = True
             status, comm = handler.get_comments(problem_id, user.email)
             if not status:
                 logging.debug(comm)
                 return handler404(request)
-            submissions[user.email] = (msg[user.email], comm)
+            submissions[user.email] = (subs[user.email], comm)
         else:
-            logging.debug(msg)
+            logging.debug(subs)
             return handler404(request)
     else:
         return handler404(request)