I'm reading online Salah Saadalla's translation of the Kurdish classic Mem and Zin, and I've reached the part where the eponymous lovers, along with their respective siblings, meet each other at Nowruz (Newroz) festivities.
In chapter 13, Mem and Tajdin disguise themselves as girls for Newroz:
Except only Mem and Tajdin
Who were as girls disguising
The reason they were disguising
Was to avoid any formal undertaking
While there, in chapter 14, they meet Zin and Siti, who are disguised as boys, and the two pairs of young people fall in love.
What I don't understand is why were they disguised, the boys as girls and the girls as boys? Of course it makes for a more interesting and entertaining story, but what was the characters' in-story motivation for disguising themselves? I can't find any statement of the reason for Zin and Siti, in the chapters focusing more on them, and the explanation given for Mem and Tajdin is obscure to me: what does "to avoid any formal undertaking" mean in the quote above?