A geo-spatial grammar comprises rules, syntax, and other means by which a data input is determined to have a meaning associated with a particular event. The event may then be provided to an application, such as a calendaring or messaging application. As a benefit, an input, such as a user speaking the phrase, “I'll be there in an hour,” may be interpreted, via the geo-spatial grammar, as an event (e.g., “I'll be in the office,” “I'll join you for dinner,” “I'll be home,” etc.). An application may then perform an action based upon the event (e.g., reschedule the meeting that starts in five minutes, present directions to the restaurant on the user's car's navigation system, notify the user's spouse, etc.).