The Solemnity of the Immaculate Conception is not a fast and/or abstinence day. It is a day of celebration. It is also a holy day of obligation. Catholics are obliged to attend Mass on this day if at all possible.
DISCLAIMER: Catholic Answers has turned over the archive to Catholic-Questions.org and no longer owns, manages, or moderates the forums. For additional apologetics resources please visit www.catholic.com.