When to use:
Page Post Event: Promote your Facebook Event to get more responses.
Page Post Like Ad: When you are looking to build the number of Fans you have on your business page and build relationships with all the people who matter to your business.
Page Post Event: Customize your headline and ad text to tell people why they should attend.
Page Post Like Ad: Find people who are the right fit for your business using custom audiences, location, age and interest targeting.
Design Guidelines Facebook Image Size Page Post Event, Page Post Like Ad
Recommended image size: 1200 x 444 pixels.
Text: 90 characters
The date and time from your Facebook Event will automatically show in your ad.