I successful migrated Outlook's contacts into Gmail contacts, but for some reason I'm not able to import my Outlook's Task's CSV into Google Calendar.
The process from Google detailing event importation from iCal or CSV formats is shown here, and is fairly simple - you just need to export your calendar from Outlook in an appropriate format, and import it into your Google account. iCal is the preferred format, as CSV formats might not work correctly with recurring events. The process to export your calendar in iCal format is outlined in this article.
Likewise, you might also want to see this Microsoft KB article: Transfer calendars between Outlook and Google Calendar, which outlines the process from Microsoft's perspective: