If you use Facebook (which 800,000,000 people do) and use Google Calendar as your main form of organization, you will find this really handy.
Open up your Facebook events. Click on an event you are attending. On the top right you will notice a settings icon with a drop down, click it. Select the option “export event” and a popup will open. (I had to blur out some of the info).
Once you click on the link it will open up google calendar. If you are having problems you can do this manually by creating a new calendar and for the url paste the url Facebook gives you. This will sync all events on Facebook for you so you can be alerted on your android phone.