It’s quite easy to find TCFL outside of China (but I’d be curious to know when and where the conferences on the mainland take place):
Singapore Centre for Chinese Language –
Teaching and Learning of Chinese as a Second Language
The School of Chinese, University of Hong Kong
International Conference of Teaching Chinese as a Foreign Language
British Chinese Language Teaching Society
BCLTS International Conference on Teaching & Learning Chinese
World Language Chinese Association (Taiwan)
International Conference on Teaching Chinese as a Second Language (TCSL)