add fab-core in Bali

docs/Bali_Fab_Fest_WS/index.md

 # Bali Fab Fest WS
 
+## [Schedule](https://docs.google.com/spreadsheets/d/1FybZ3BnA0Ue495cYrd1JnPxinwhd3k0--hTfCf0w0cA/edit#gid=183275108)  
+
 - Oct 15 (Sat) 14:00-18:00 @Fab Lab CL1-FL
 - Oct 16 (Sun) 09:00-12:30 @Bedawang Nala 4
-- Oct 17 (Mon) 14:00-18:00 @Jungle Park
+- Oct 17 (Mon) 14:00-18:00 @Fab Lab CL2-FL
+- Oct 18 (Tue) 14:00-18:00 @Fab Lab CL2-FL
+
+
 
 ![](./images/insta_ws.png){width=600}
 
@@ -145,7 +150,15 @@ GND<br/>A10<br/>A9<br/>A8|GND<br/>CLK<br/>DIO<br/>RST
 
 
 
-### Install mattairtech board
+### Install mattairtech / fab-sam board
+
+!!! Note
+    [fab-sam](https://github.com/qbolsee/ArduinoCore-fab-sam) is a Fab community fork of the original MattairTech SAM D|L|C Core.  
+    Using this core is recommended in Fab Academy.  
+
+    `https://raw.githubusercontent.com/qbolsee/ArduinoCore-fab-sam/master/json/package_Fab_SAM_index.json`  
+
+    ![](./images/fab_sam.png)
 
 1. Menu Arduino IDE -> Preferences  
   ![](./images/pref.png){width=600}