If you CTB before any significant events, people closest to you will always affiliate that event with sorrow. There is no doubt your friend, even when they're done grieving, will always affiliate their marriage with the death of what they deemed a friend, should you decide to CTB imminently afterwards.
The read your question from an internet stranger is looking at it from a different perspective, as if someone else if asking it. If I posted about wanting to CTB after a friend's wedding, but have doubts on the date in fear of hurting my friend and considering delaying it, how would you answer?