I've just updated the webpage https://batc.org.uk/contests/ with dates through until February 2020 as follows:
19th October 2019 – 20th October 2019: ATV Activity Weekend
16th November 2019 – 17th November 2019: ATV Activity Weekend
14th December – 15th December 2019 – ATV Activity Weekend
1200 UTC 21st December 2019 – 1800 UTC 1st Jan 2020 – Christmas repeater Contest
11th January 2020 – 12th January 2020 – ATV Activity Weekend
15th February 2020 – 16th February 2020 – ATV Activity Weekend
Note that the November activity weekend dates are wrong in CQ-TV 265 as the weekend is still Saturday and Sunday!
There seem to be two versions of the activity weekend page on the website.
https://batc.org.uk/contests/ goes to a page with the correct dates for this coming weekend and the dates for next year.
Clicking on "Contests & Maps" and then "ATV Activity Weekends" from the menu bar leads to an old version of the same page: https://batc.org.uk/contests/atv-activity-weekends/