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PyData Bristol often has good talks. It used to be hosted in the Ovo building (the energy company), but travels around. https://www.meetup.com/PyData-Bristol/

Lots of other meetups for various aspect of tech. It's Bristol Tech Festival this week too. https://techspark.co/tech-festival/

SWMobile https://www.meetup.com/swmobile/ is good if relevant.

Also SWUX https://www.meetup.com/swux-meetup-com/ which is UX (so not technically tech), but has an excellent tech-adjacent community, and lot of members who work for tech companies even if they're not techies themselves.

I've always enjoyed going to the MLops meetup (https://www.meetup.com/mlops-community-bristol), always very good talks on a wide range of subjects.

There is also PyData Bristol (https://www.meetup.com/pydata-bristol/)