Trains from Forest Hill at Weekends

Please can someone point me to a schedule for the remaining weekends this year? I need to know which weekends we will have services.

The TfL live status page has a section where you can check future dates for line closures/engineering work - not sure how far in advance it goes but at least 4 weeks I would think

National Rail Journey Planner is best for checking a specific journey on a specific date. Timetables are loaded for 12 weeks, however over the last couple of years engineering work has sometimes been updated within 12 weeks! However I have just checked with them today and they are still advising it should be accurate for 12 weeks!

However if you prefer to check if there is engineering work planned on specific dates then go to National Rail Future Engineering works
Select date and Rail Company/Train Operator (e.g. Southern or London Overground

In addition London Overground engineering work is also shown on TfL’s website for up to 6 months ahead, but is frequently updated!. It is also not unusual to find the information on TfL and National Rail do not match!