Since nobody posted on 14 i’ll just do one.
14 children of Leah (according to the peshat that each child had a twin)
15 Shir Hamalos
15 steps in the beis hamikdosh
15 day of Shvat is the birthday for the trees
15 day of Av is a Yom Tov
15 day of Tishrei is Succos
15 day of Nissan is Pesach
15 day of Adar is (Shushan) Purim