NLT has maintained a list of microwave-oriented symposia here for a little over 15 years. When it was started, it was the only comprehensive list on the internet, but by now, there are others that are, frankly, better maintained. For this reason we have stopped listing conferences here. At one time, the MTT Society maintained a conference calendar, but now it uses a search on the IEEE web site. I don't know how complete it is, but in any case, you can find it here: IEEE MTT Society Conference Listing .