Engagement party vs family trip?

My friends engagement party is on the 30th this month.My family just planned a trip to Kuala Lumpur, Malaysia from 28th Dec to 1st Jan. Which should I

My friend's engagement party is on the 30th this month.
My family just planned a trip to Kuala Lumpur, Malaysia from 28th Dec to 1st Jan. Which should I go to?
On the engagement party, he was there helping out the whole day! But this is the first trip that my family has planned in ages! Help.

or:My friend's engagement party is on the 30th this month.My family just planned a trip to Kuala Lumpur, Malaysia from 28th Dec to 1st Jan. Which should I go to?On the engagement party, he was there helping out the whole day! But this is the first trip that my family has planned in ages! Help.

Tags:1st,engagement,