I'm the on the national UK committee for BCSWomen and my role is Academic Liaison. This means I generally do work linking university students and staff with the society and women in the BCS.
I started the BCSWomen Lovelace Colloquium, our main event for women students of computing and related subjects, and I chair that event still. It moves around the country every year (so far, it's been in Leeds, Leeds, Cardiff, Birmingham, Bath, Nottingham, Reading, and Edinburgh; in 2016 it'll be in Sheffield). My role is to find speakers, organise sponsorship, chair things on the day, handle student posters and travel, and ensure that the day goes as smoothly as possible. We have had about 650 women attend over the last 8 years. You can find out more about the BCSWomen Lovelace Colloquium on our main site, hosted in Aber at https://www.aber.ac.uk/en/cs/engagement/lovelace-colloquium/ I also help out every year at the big postgraduate women event (the London Hopper).
I've put together workshops on various topics (AI, wearable computing, and so on) but the main one I've done with a BCSWomen hat on is Android programming with AppInventor. If you'd like to run a workshop for families, this is a good one! We've run it with family groups aged 6+ and it works well. All materials are available from that link. In 2015, we ran this workshop as a world record attempt, and 1000+ people simultaneously learned to code android apps.
I speak and write about women in computing. Speaking has taken me to all sorts of events (from GCHQ's equality and diversity week to the Electromagnetic Field hacker festival).
I also spent four years as deputy chair, but stood down in 2012. I prefer working in a hands on way - putting on workshops, organising conferences, writing articles, giving talks... rather than dealing with committees and so on. I know that it's the politics and committees which are likely to make the big change, but I'm really not cut out for that kind of work. I'd much rather be building something or teaching something than trying to be political:-)
I'm on the committees of the local BCS Branch, and currently am deputy chair - you can find out about our activities here: BCS Mid Wales branch.