Who do the underlined possessive adjectives "their" in the ...

        Six thousand couples decided not to let the coronavirus deter them from celebrating their happy day. The multiple brides and grooms attended a mass wedding ceremony in South Korea's Unification Church on Friday, in spite of the health scare from the coronavirus in neighbouring China. The newlyweds were joined by 24.000 guests; some renewing their marriage vows and others watching friends and family tie the knot. The church seemed well prepared for such a large-scale event as staff handed out hand sanitizer and surgical masks to all attendees. They also checked the temperature of the couples. 

Adapted from: <https://breakinqnewsenglish. com/2002/200211-masswedd ing. html>