You can use your Omnibox to access Google Calendar's 'quick add' function. simply follow these steps:
1. Go to 'Settings->Search->Manage Search Engines' 2. Scroll down to the fields labeled 'Add a new Search Engine' 3. In the first field, type in 'Google Calendar' 4. In the Keyword field, type in 'Calendar' 5. In the third field, copy and paste this URL: http://www.google.com/calendar/event?ctext=+%s+&action= TEMPLATE&pprop=HowCreated%3AQUICKADD. 6. Click 'Done'
Now type 'Calendar' into the Omnibox and hit Enter, and you should get a solid tab box that says 'Search Google Calendar'. Use plain sentence-style English to describe a future event with all the whats, wheres, and whens. Google is fairly adept at wringing out the details and translating it into a Calendar event.