[New] Add date variable

_drafts/open-mic-announcement-template.markdown

@@ -5,10 +5,15 @@ categories: [Open Mic Announcement, Open Mic]
 
 
 <!-- Naming convention: post MUST be named beginning with YEAR-MM-DD-title.MARKDOWN. Create a COPY of this file in _posts and rename it according to the convention. The date is not date of presentation, but date of publication of the announcement. The title in human readable form is put in the quotes to the title parameter in front matter  -->
-<!-- Fixing content of this file before publishing: replace all variables within this file surrounded by `${` `}`, then remove all comments from this file  -->
+<!-- Fixing content of this file:
+  - [IF NOT RUNNING FROM GITHUB ACTION] replace all variables within this file surrounded by `${` `}`, example values are:
+    - OPEN_MIC_SESSION_TITLE=`Debugging SPARQL queries`
+    - OPEN_MIC_SESSION_DATE=`Friday 4 April 2023`
+  - remove all comments from this file
+-->
 
 
-Content: Fill in when and where the next open mic session will take place. Remember, first paragraph is also an excerpt, so keep it short and informative. The best practice is: The Open mic session starts on Friday 14 April 2023 at 10:30 via [this link](https://meet.jit.si/open-mic-kbss). The speaker is [Miroslav Blaško](https://kbss.felk.cvut.cz/web/team#miroslav-blaško) who is going to talk about something really interesting.
+Content: Fill in when and where the next open mic session will take place. Remember, first paragraph is also an excerpt, so keep it short and informative. The best practice is: The Open mic session starts on ${OPEN_MIC_SESSION_DATE} at 10:30 via [this link](https://meet.jit.si/open-mic-kbss). The speaker is [Miroslav Blaško](https://kbss.felk.cvut.cz/web/team#miroslav-blaško) who is going to talk about something really interesting.
 
 You may also include picture. For pictures, place them somewhere in assets/images/... and use following code: