Get permission from your friends whether they ok to have your fiancé. If they happen to ask, then explain that it is your initiative that you want her to explore/enjoy Malaysian culture, the world you came from. The idea is to give a positive impression.
If ok, then invite your fiancé and explain to her that you really really want to go. Assure her that you will keep your safe distance (minimal physical contact) and keep your level-headedness (e.g. avoid getting intoxicated). Assuming you and your friends have no ulterior motives, then your fiancé has absolutely nothing to be worried about and you can enjoy the gathering together.

Taking a step back, I think this small event is a good opportunity for you both to learn how to trust each other more. That said, you're already together for 7 years, long enough for anyone to be (too) comfortable in the status quo, so if you love her and you want more freedom in life, you'll need extra effort to make it happen, good luck.