Minsk will host JESC at the Minsk Arena in November 2018
https://www.ebu.ch/news/2017/10/belarus-chosen-to-host-2018-junior-eurovision-song-contest
"To ensure the longevity of the Contest and allow more time to prepare the event, the JESC Steering Group decided to remove a clause in the rules that gave the winning broadcaster first refusal to host. Earlier this year EBU Members were given the opportunity to apply to host JESC 2018 and BTRC's application was judged to be the best."
https://www.ebu.ch/news/2017/10/belarus-chosen-to-host-2018-junior-eurovision-song-contest
"To ensure the longevity of the Contest and allow more time to prepare the event, the JESC Steering Group decided to remove a clause in the rules that gave the winning broadcaster first refusal to host. Earlier this year EBU Members were given the opportunity to apply to host JESC 2018 and BTRC's application was judged to be the best."