It's the weekend of 26th / 27th when Halloween events occur. You may have noticed people dressing up, companies doing stuff....etc. Frontier usually does something as well in the form of a store update. Looks like they missed it this year.
I've noticed a fairly high proportion of chain retailers desperately trying to turn it into a 'holiday' but that's about it. The dressing up used to be confined to the night itself when the American abomination that is 'trick or treating' happens.
(Note - your opinion of this will probably vary depending on whether you live on a nice private housing estate where jolly, well-scrubbed middle class children will be chaperoned around the houses by a couple of parents to pick up sweets, with some mild rascally behaviour being aimed at the local grinch when he doesn't have said confectionery to hand out, or an area like the one I live in where 15 and 16 year old thugs in 50p Scream masks demand money with menaces from pensioners in order to buy weed, with fireworks being thrown through their letterbox if they have the audacity to refuse.)
Frankly I wish we could go back to the innocent fun of celebrating a plot to blow up the government at this time of year