Below is a list of the astronomy conventions or meetings that I know of that are organised in the UK. If you are looking for a list of star parties, click here.
If I have missed any meetings out, please let me know so that I can include them.
Click on the name to go to their Web site.
Organised by Astronomy Now Magazine.
Held in the Spring at Kensington Town Hall.
BAA Winchester Weekend.
As well as the annual Winchester weekend, the BAA also organise other meetings throughout the year.
Federation Of Astronomical Societies.
Coinciding with their AGM, usually held in the autumn.
Herstmonceux Astronomy Festival.
Held at the Observatory Science Centre in Sussex in the autumn.
International Astronomy Show.
Held in the Midlands in October each year.
North West Astronomy Festival.
Held in Cheshire during the Summer.
Practical Astronomy Show.
A free event, covering all aspects of practical astronomy.
First event to be held in Kettering in March 2019.
SAGAS Annual Convention.
Organised by a group of societies south of London.
Society for Popular Astronomy.
Organise a Preston Montford Weekend Course as well as quarterly meetings in London.
Gathering near Dublin all about the Sun.
Music And Astronomy Festival held near Builth Wells in the Summer.
South Downs Astronomy Festival.
A day of talks and trade stands on the South Downs.
South West Astronomy Fair.
A day of talks and trade stands held at The Norman Lockyer Observatory, Sidmouth.
Webb Deep Sky Society.
Held alongside their AGM, trade stands and talks on deep sky objects.