this probably falls under "you might not be as non-autistic as you think harp" but consider
you know those 'touch tanks' that ppl do for their toddlers
that but we're all adults. there's a storage tub full of rice you can just stick your hand in while you sip a beer. there's also a kiddie pool of cornstarch goo you can slap in a satisfying non-neutonian manner. like just 5-6 stations like this.
it'd be a pretty fuckin great party my dudes
it's still a good idea though
"let us all go stick our hands in this pool full of beans because it's oddly satisfying" would be a great icebreaker