We have something going to print today, but everyone in the office is arguing as to where to correctly place the apostrophe in the sentence (if at all!)
The sentence is:
Bring your event into the palm of your guests hand
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Assuming you're referring to a single "guest", the possessive apostrophe should come before the s:
Bring your event into the palm of your guest's hand.
But I have a suspicion that guests was meant to be plural (because of the context). In that case, you should pluralize palm, hand and guest, and put the apostrophe after the last s in guests:
Bring your event into the palms of your guests' hands.
Yeah, you need an apostrophe, and I'd say it should be "guests'". Generally, one has events for more than one guest, which is why I suggest plural. But the idiom is "in the palm of your hand". Use the singular when everyone being referred to has one (in this case, only one is operative regardless of the fact that most everyone has two). [I'm sure that I read this advice in a Grammar Girl tip.] Otherwise, the sentence is saying something ambiguous: "in the palms of their hands".
You wouldn't want to say "Place your powder on the lesions in your patients' mouths" (each patient has but one mouth and may have only a single lesion in that one mouth) but "Place the tablet on the lesion in a patient's mouth".
So maybe you'd want to say it another way: Bring your event into the palm of each guest's hand.
Not using an apostrophe is probably not unheard of: Mothers Day, Ladies Room, and a few other standard usages argue for no apostrophe in certain cases. But I don't think this is one of those.