Can't invite guests to wedding.

Sunday. Scheduled the wedding on the calendar for seasons. The wedding is on Monday, but the planning for guests shows up with one person, Summer Holiday, who neither husband or wife is friends with.
Wife has a twin sister, two parents, twin's fiancee. Husband has two or three siblings, but I care less about them (low friendship.)
Wife is very close with her family, and her sister is her best friend. Her husband knows the family, friends with parents, good friends with twin.
I considered it was because of conflicting career time, but all are unemployed, except for the twin, who doesn't work Mondays. I still set it as a day off holiday, without goals. Can't invite guests. PS4