diff --git a/hackathon/callref-old/README.md b/hackathon/callref-old/README.md
deleted file mode 100644
index cf3ee4f..0000000
--- a/hackathon/callref-old/README.md
+++ /dev/null
@@ -1,4 +0,0 @@
-Contributors:
-* [http://github.com/Anastassija Anastasia Izmaylova]
-* [http://scg.unibe.ch/staff/jankurs Jan Kurš]
-* [http://github.com/grammarware Vadim Zaytsev]
diff --git a/hackathon/coupling-xml/README.md b/hackathon/coupling-xml/README.md
new file mode 100644
index 0000000..4b23d29
--- /dev/null
+++ b/hackathon/coupling-xml/README.md
@@ -0,0 +1,7 @@
+This is an illustration, an example that was prepared before the hackathon in order to demonstrate the kind of contributions that will be expected.
+
+Repository with solution:
+* [coupling101demo by rlaemmel](http://github.com/rlaemmel/coupling101demo)
+
+Contributors:
+* [Ralf Lämmel](http://github.com/rlaemmel)
diff --git a/hackathon/json-python/README.md b/hackathon/json-python/README.md
new file mode 100644
index 0000000..0bc88c0
--- /dev/null
+++ b/hackathon/json-python/README.md
@@ -0,0 +1,7 @@
+This is an illustration, an example that was prepared before the hackathon in order to demonstrate the kind of contributions that will be expected.
+
+Repository with solution:
+* [json101demo by rlaemmel](http://github.com/rlaemmel/json101demo)
+
+Contributors:
+* [Ralf Lämmel](http://github.com/rlaemmel)
diff --git a/hackathon/loc-python/README.md b/hackathon/loc-python/README.md
new file mode 100644
index 0000000..6e162b6
--- /dev/null
+++ b/hackathon/loc-python/README.md
@@ -0,0 +1,7 @@
+This is an illustration, an example that was prepared before the hackathon in order to demonstrate the kind of contributions that will be expected.
+
+Repository with solution:
+* [loc101demo by rlaemmel](http://github.com/rlaemmel/loc101demo)
+
+Contributors:
+* [Ralf Lämmel](http://github.com/rlaemmel)