public class  NewTaskSchedulerController {
    public Event Event {get; set;}

    public NewTaskSchedulerController(){
        Event = new Event();
    }

    public PageReference save() {
        try{
            //Already getting null when I try to get the input value
            system.debug(Event.Activity_Location__c);
        }
        catch (Exception exc) {
            ApexPages.addMessages(exc);
        }
        return null;
    }
}

<apex:page controller="NewTaskSchedulerController">
    <apex:inputField value="{!event.Activity_Location__c}" id="loc"/>
<apex:page>