Non-Jewish Wedding

Question

I have two such situations. I am not sure what factors are of relevance to my question so I share with as many details as necessary below. I hope it provides enough detail. The first is for a co-worker in my group whom I interact with daily. I do not feel this will necessarily damage the professional relationship but I am expected to show up, particularly as others will within the group. The second is that of a very important client. If I do not attend this could hurt my relationship with the client. I would catgorize it as having the potential for hefsed meruba. Thank you