Matrix Chatroom - There is a Glasgow wide chat room based on the open source software Matrix (similar to Discord but open source and decentralised). There are a lot of people there who have been to previous r/glasgow meetups. Direct invite link.

Thirsty Thursdays - LordAnubis12 organises a meetup for the r/glasgow crowd on Thursday nights, every two weeks. The venue changes each time. Look for a stickied post on r/glasgow.

Browse the list of meetup.com groups in Glasgow: https://www.meetup.com/cities/gb/v2/glasgow/

Check out the list of Groups and Interests and join something that takes your interest

Have a look at the list of Community Groups and see if they are hosting any new-to-town nights.