Theme weddings can be a tricky feat to pull off -- being too on the nose can get kitschy, but too subtle and there's not much of a point. Halloween themes in particular toe a fairly thin line between gauche and brilliant. If you're planning an October wedding, and feel like the 31st could be your perfect date, you gotta lean into it...the perfect amount. To hit the Halloween mark and spook your guests just enough, put some thought behind it!
When you're designing the look of your home, you don't want to lead with a theme, necessarily, but an aesthetic. For example: Instead of a nautical theme, where you put rope and anchor motifs everywhere, plan for "coastal" and work off of color schemes and textures that make you think of that theme.
The same goes for designing your wedding. If you say it's a Halloween wedding, you're going to end up with jack-o-lantern centerpieces and artificial spiderwebs along the bar. But if you think of the aesthetic of spooky season, what comes to mind? Black and deep reds, haunted opulence, potions and witchcraft. By incorporating these elements into your big day, rather than get too close to a true theme, you'll execute the All Hallow's Eve wedding day of your dreams nightmares.