They are planning _____ out to dinner tonight.

To take their guests

Guests taking

Taking their guests

Guests to take

"They are planning to take their guests out to dinner tonight."

وہ آج رات اپنے مہمانوں کو باہر کھانے پر لے جانے کا منصوبہ بنا رہے ہیں۔

This phrase correctly indicates that they intend to accompany their guests to a dinner event.