diff --git a/builder/build.py b/builder/build.py
index b77a223..f13811b 100644
--- a/builder/build.py
+++ b/builder/build.py
@@ -261,14 +261,14 @@ def minutes_after_one(time):
             dcontent += session['platform']
         dcontent += ")</h3>"
         col = 2 * di + 2
-        row = 2 + minutes_after_one(session['start'])
-        rowend = 2 + minutes_after_one(session['end'])
+        row = [3, 15, 23][si]
+        rowend = [13, 21, 23][si]
         if di == 0:
             tt_content += "<div class='gridcell timetableheading rotated' style='"
             if session["platform"] == "Gather Town":
-                tt_content += f"grid-column: {col - 1} / span 1; grid-row: {row + 1} / span 1"
+                tt_content += f"grid-column: {col - 1} / span 1; grid-row: {row} / span 1"
             else:
-                tt_content += f"grid-column: {col - 1} / span 1; grid-row: {row} / span {rowend - row}"
+                tt_content += f"grid-column: {col - 1} / span 1; grid-row: {row - 1} / span {rowend - row + 1}"
             tt_content += "'>"
             tt_content += markup(f"Session {si + 1} (<time {day} {session['start']}>&ndash;<time {day} {session['end']}><tzone>, "
                                  f"{session['platform']})", paragraphs=False)
@@ -278,6 +278,8 @@ def minutes_after_one(time):
         if "chair" in session:
             dcontent += (f"<div class='authors' style='margin-top:-10px;margin-bottom:10px'>"
                          f"Chair: {person(session['chair'])}</div>")
+            tt_content += (f"<div style='grid-column: {col} / span 1; grid-row: {row - 1} / span 1;margin:10px;font-size:80%;text-align:center'>"
+                           f"Chair: {session['chair']['name']}</div>")
         if "talks" in session:
             talklen = (rowend - row) / sum(3 if is_long(t) else 1 for t in session["talks"])
             start = 0
@@ -288,7 +290,7 @@ def minutes_after_one(time):
                     dcontent += talk(t, day, si + 1, session_time, next_and_prev[t]["prev"], next_and_prev[t]["next"])
                 title, speaker = get_title_and_speaker(t)
                 length = 70 if is_long(t) else 20
-                rows = 30 if is_long(t) else 10
+                rows = 3 if is_long(t) else 1
                 if t == "intro":
                     tt_content += "<div"
                 else:
@@ -312,7 +314,7 @@ def minutes_after_one(time):
                 start += rows
         else:
             tt_content += (f"<a class='gridcell timetabletalk' href='/gather-town.html' style='"
-                           f"grid-column: {col} / span 1; grid-row: {row + 1} / span 1'>"
+                           f"grid-column: {col} / span 1; grid-row: {row} / span 1'>"
                            "<div class='timetabletalktitle'>Discussions</div>")
             if "description" in session:
                 tt_content += f"<div class='timetabletalkspeaker'>{session['description']}</div>"
@@ -321,8 +323,8 @@ def minutes_after_one(time):
             row0 = 2 + minutes_after_one(timetable[day][si - 1]['end'])
             row1 = 2 + minutes_after_one(session['start'])
             tt_content += ("<div class='gridcell timetableheading' style='"
-                           f"grid-column: 2 / span 3; "
-                           f"grid-row: {row0} / span {row1 - row0}; "
+                           "grid-column: 2 / span 3; "
+                           "grid-row: 13 / span 1; "
                            "display: flex; justify-content: center; align-items: center;'>")
             tt_content += " &nbsp; &nbsp; &nbsp; ".join("BREAK")
             tt_content += "</div>"
diff --git a/files/sty.css b/files/sty.css
index 70db96b..c25caa3 100755
--- a/files/sty.css
+++ b/files/sty.css
@@ -70,7 +70,7 @@ td.heading {font-weight:bold;font-size:80%}
 .timetablegrid {
   display:grid;
   grid-template-columns: auto 3fr 0.1fr 3fr;
-  grid-template-rows: auto repeat(180, 1fr) 2fr auto;
+  grid-template-rows: auto auto repeat(10, 1fr) 2fr auto repeat(6, 1fr) 10px auto;
 }
 .timetableheading {font-weight:bold;font-size:80%}
 .timetablegrid .gridcell {
diff --git a/talks/_timetable.yml b/talks/_timetable.yml
index 0fccadb..229d5cb 100644
--- a/talks/_timetable.yml
+++ b/talks/_timetable.yml
@@ -9,6 +9,14 @@ Thursday:
     start: "13:00"
     end: "14:40"
     platform: Zoom
+    chair:
+      name: Matthew Scroggs
+      github: mscroggs
+      twitter: mscroggs
+      mastodon: mscroggs@mathstodon.xyz
+      website: https://mscroggs.co.uk
+      email: matthew.scroggs.14@ucl.ac.uk
+      zulip: Matthew Scroggs
   - talks:
       - salib
       - sky
@@ -19,6 +27,9 @@ Thursday:
     start: "15:00"
     end: "16:00"
     platform: Zoom
+    chair:
+      name: Luna Arthur
+      twitter: LunaAArthur
   - start: "16:00"
     end: "17:00"
     platform: Gather Town
@@ -36,6 +47,8 @@ Friday:
     start: "13:00"
     end: "14:40"
     platform: Zoom
+    chair:
+      name: Ignacia Fierro-Piccardo
   - talks:
       - brown
       - eaves
@@ -46,6 +59,13 @@ Friday:
     start: "15:00"
     end: "16:00"
     platform: Zoom
+    chair:
+      name: Andreas Longva
+      email: longva@cs.rwth-aachen.de
+      affiliation: RWTH Aachen University
+      github: Andlon
+      twitter: andreas_longva
+      zulip: Andreas Longva
   - start: "16:00"
     end: "17:00"
     platform: Gather Town
diff --git a/template/intro.html b/template/intro.html
index 08b8899..4f9f4ce 100644
--- a/template/intro.html
+++ b/template/intro.html
@@ -8,7 +8,7 @@
 <title>{{pagetitle}}</title>
 <link rel="preconnect" href="https://fonts.gstatic.com">
 <link href="https://fonts.googleapis.com/css2?family=Prompt&display=swap" rel="stylesheet">
-<link rel='stylesheet' type='text/css' href='/sty.css?v=2023-07-12'>
+<link rel='stylesheet' type='text/css' href='/sty.css?v=2023-07-12.1'>
 <script src="https://polyfill.io/v3/polyfill.min.js?features=es6"></script>
 <script id="MathJax-script" async src="https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js"></script>
 <link rel="apple-touch-icon" sizes="57x57" href="/icons/apple-icon-57x57.png">