Who did you talk to with the yellow vests on with the SAU logo?
Did you introduce yourself to people as someone who wanted to join the club and find out more about it?
Just because people don't talk to you, doesnt mean they mean to be rude or dislike you in anyway. I can be quiet before a few drinks but I don't think any less of people, just can be shy. From the pics, committee had the yellow vests on and would have helped you.
Come along to a club meet at the Bells and identify yourself to a committee member and you will find it very different.
As a tip, if you are with someone, you are less likely to be approached than if you are on your own.