I am answering for Joss:
Next year's Classical Guitar section of Leicester MusicFest will most likely be held at a similar date and place (February 2019), but it is too early to be specific. If you check the MusicFest website periodically there will be updates.
You can also sign up for newsletter updates at http://www.leicestermusicfest.com/contact
As the whole festival is organised and run by a dedicated team of volunteers, please be patient!