Our webinar team has provided a follow up to this. If you happened to register for the webinar that's experiencing issues with the Google Calendar link, you can email webinars(at)constantcontact(dot)com and they will manually send you a link, or they mentioned that you could use the iCal option to add it manually into your Google Calendar.
Here's how:
Click the "iCal" option in the email you received.
Go to Google Calendar, click the gear icon (top right).
Choose "settings" in the drop-down menu In the left column, you should see the option for "import & export"
Under "import" hit "select file from your computer"
Find the file you just downloaded.
It should say "Online Marketing Must-Haves_Your Roadmap to Driving Results.
Double click it.
Click "Import"
Sorry for the additional steps and the trouble. This just seems to be something happening with just this one webinar.
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