There are a few comicons about in the UK, so you may be able to find something nearer (and cheaper) as a taster.
Smaller ones can be more intimate but there will be various activities at large and small events.
There will be traders - not necessarily comic sellers. I’ve heard comments about how few comic traders there were at some (they aren’t all titled comicons, they may be ‘film and comicon’ etc) and there are often a lot of Pops sellers.
Each organiser may run different activities but you will find:
Celebrities and/or ‘celebrities’ - Doing signing and photo opportunities (which will cost money)
‘Professional’ cosplayers - on stage, wandering and at their stall. (Plenty of photo opportunities when wandering around, and generally free or a charity bucket)
Star Wars clubs (very often with the charity buckets as the franchise protects its copyright and there are ‘recognised’ societies relying on the ‘good work’ of charity support)
Cosplay societies - clubs of enthusiasts, either as paying customers or with a stand
The ‘paying customers’ will include Individuals in cosplay and in normal clothes. Those in cosplay range from a kid in a Poundland superhero costume, and those in home made naff outfits to those rivalling the ‘professionals’
Some that I think are just in plain normal clothes turn out to be cosplay of a particular show or comic
Props companies / collectors (and set up as sets for photos etc)
You will also find activities such as DIY demos, gaming sections - current and retro computer games/consoles that you may be able to play on, plus possibly board games gaming sections
There could be Lego zones - probably displaying large Lego builds by clubs
There will be some form of cosplay competition, and this would probably be open to anyone willing to walk on stage - especially kids
Children will have fun. But there might be a limit on how long they will be interested, and that could be affected by how much is there for their particular heroes etc
I’ll be with friends trading at Creeds Bath Comcon tomorrow and they have a few more coming up elsewhere:
www.facebook.com/bathcon/
www.creedconventions.com/
Next week they will be at Exeter for Devon comicon
m.facebook.com/events/westpoint-exeter-ex5-1-united-kingdom/devon-comic-con-and-gaming-festival/1388872727919033/
m.facebook.com/ukcomiconandgamingfestivals/
We were at MCM Comicon in London just before lockdown in March 2020. That was sponsored for the then impending release of the latest Bond so had the Aston Martin and a lot of Bond themed promos going on
www.mcmcomiccon.com/
www.showmastersevents.com/