Merge branch 'r_workshop_add_instructor_names' into 'master'

Add missing instructor names for upcoming R workshop

See merge request !335

_events/2021/11/2021-11-22_R.md

@@ -4,7 +4,10 @@ layout: event
 organizers:
   - meessen
 lecturers:
-  - TBA
+  - Annajiat Alim Rasel
+  - Marco de Lucia
+  - Ranjeet Singh
+  - Richard Gayle
 type:   workshop
 start:
     date:   "2021-11-22"

_layouts/frontpage.html

@@ -27,8 +27,7 @@
                             {% assign today = "now" | date: "%Y-%m-%d" %}
                             {% assign has_upcoming_events = false %}
                             {% for event in sorted_events %}
-                            {%   if event.start.date < today or
-                                    event.registration_period.to < today %}
+                            {%   if event.start.date < today %}
                             {%      continue %}
                             {%   else %}
                             {%      assign has_upcoming_events = true %}