The East Lothian course took the decision to waive admission charges as a festive thank you to racing fans. Anyone who has already bought tickets online can apply for a refund by contacting the course.
Race goers are being advised to book online, although free turn styles will operate for on-the-day admissions.
Musselburgh Racecourse commercial manager, Sarah Montgomery, said: "It was a late call in arranging this extra meeting and we hope free entry will draw a bigger crowd and generate a great atmosphere.
"It's also a reward for our regular customers and shows that even race courses like to get in to the Christmas spirit."
Gates open on Sunday at 11am and first race is off at 12.20pm.
To book tickets please visit www.musselburgh-racecourse.co.uk