To neck-tie or not to neck-tie? That is the question.
If you are attending any meeting find out well beforehand the dress code for that meeting. Is it forma or casual? Does formal inclde a tie or juts open neck etc..?:
Organisationally there may be a code or ethos e.g. if you enter the Google building with a tie or even a jacket you may spontaneously combust whereas try joining a meeting of the actuarial directors of a major law firm in jeans and man handled ejection can be expected. Seriously though find that out in advance.
Even if an organisation with a specific dress culture there may be some instances where it changes. For instance a usually casual dress code may be altered to more formal if external attendees, maybe from a different culture or a more traditional company are being welcomed it may be a courtesy (or a business necessity) to mirror their dress code, Again find out in advance.. a mistake could cost losing a client (or your job).
One other possibility is a special occasion: a birthday or an anniversary of a senior colleague or client, or a national occasion etc… again the dress code could change for that.
So the message is find out in advance. Nobody respects a bunny suit at a remembrance meeting or a full set of tweeds at a rave.