Tim has it - some variants.

Homeless ~

Many people leaving for their hometowns made a big city like chengdu become empty during the spring festival. More than ever during festivals we think of loved ones．I miss my dad now.

Many people leaving for their hometowns made ...

Many people taking crowded transport to their hometowns made ...

Many people traveling to their hometowns make big cities like ChengDu become ...

I can't go with "caused emptiness". Just seems a little translated. :)

... made cities like Chengdu seem empty ...

Homeless ~

Many people crowded travelling to their hometown made a big city like Chengdu became empty during the Spring Festival.每逢佳节倍思亲．I miss my dad now.

homeless ~

Many people travelling to their hometown caused emptiness in a big city like chengdu during the spring festival.每逢佳节倍思亲．I miss my dad now.