A little food for thought. Let us suppose you are a scientist and have written a conference paper. Two conferences would possibly accept the paper. They take place around the same time, one at an exotic location you always wanted to visit and one in a dull location you've unfortunately visited many times before. To which conference do you submit the paper? For those not familiar with scientific practice, it is not done to send the same paper to two conferences at the same time and publishing papers is core business for scientists.
After about a year in my new job on educational data mining I invited all collaborating colleagues (5) to write a paper on what we had discovered so far. They all took up the challenge and only after the paper was finished two asked: what is the conference location? Oh well, it is within cycling distance. I checked that before inviting them.