First, what exactly are we talking about doing. We are going make a poster or flyer for an event and add a QR code (bar code) to it. This will allow someone with a smart phone to scan the QR code and automatically add that event to their Google Calendar.
Here is how it is done:
Step 1: Design your poster or flyer (Duh!)
Step 2: Go to the Google Calendar Event Publisher web page and create your event. (You can even add the location of the event)
Step 3: If you have not done so click on "Create button HTML" at the bottom. Look for the <a href=" at the beginning of the HTML code. Select everything between the quotes (make sure you are between the correct quotes) and copy it.
Step 4: Go to this website http://gaigalas.net/lab/googl Take the web address that you just copied from the HTML code and paste it into the URL field.
That will produce a URL shortcode and a QR code.
Final Step: Right click on the QR code (the funny bar code looking thing) and save the image. Now you can add it to your event flyer or poster. (be sure not to expand the image to large so that it will not become fuzzy or pixelated).
Now anyone with the a cell phone or device capable of scanning that code will be able to add the event to their personal Google Calendar.
For more information on Google Calendar please check out either of my Google Calendar Training pages at SmallSchoolBigTech.com or atGoogle Teacher Academy Resources
Or If you have any questions please leave it in the comments so I can respond.