I totally agree with @Jabba_the_gut. This year’s SEBB was my first and, as a foul-mouthed anti social misanthropist, I was quite nervous of attending, not just because of my borderline personality disorders but also for exactly the reasons @Jabba_the_gut mentioned...
...if you think that they will be dominated by exceptionally talented folk continually slapping on boutique basses.
I do play in a band but I’m not a very good player, I dont read music nor do I slap yet I was made to feel very welcome despite only having one little amp and one little bass. Everyone was really friendly and I was surprised just how many people were interested in my little bass! Seriously I arrived and sat in the car park watching folk unload their gear and I almost drove back home, what an idiot. I had a top time with some genuinely lovely folk and I had a chance to drool over many, many gorgeous basses. The most difficult part of the day was stopping myself chinning @Jabba_the_gut and runnng off with one a bass he’s built and that I’ve fallen in love with.
If you are sweating it, don’t, just go, you’ll have a time.