It is not permissible to transport any one who intends to visit these shrines or to attend a banquet that is prepared for that shrine. Doing so is tantamount to committing a sin as this is a kind of cooperation in evil and aggression even though those who want to go there are one's parents. The Prophet (peace be upon him) said:
"There is no obedience to a creature in defiance to the Creator."
May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.