Child party etiquette - should food be provided for parents too?

[CoalCraft]

We're planning a birthday party at a soft play place. The birthday package includes drinks and hot food for the kids, with platters for the adults available as an extra. Attending kids will be aged 2 - 4 so parents will obviously be staying. I say that we don't need to feed the adults and they can buy their own food if they're hungry (there's a cafe attached and prices are very reasonable), but DH says that's being bad hosts and we should make sure there's at least picky bits for the grown ups.

We've only been to one such party before, which was a BBQ at birthday child's house. Adults were given a burger / hot dog each so maybe DH has a point?

What's the general etiquette?

I always did an adult platter for at home parties that parents were staying at, at soft play I did a hot drink tab.

Yes, I've never been to a paid bar at a wedding! Wine on the tables for the meal but then you buy your own. I am at odds with a lot of the 'MN culture' though as I take being invited to a wedding as a very nice gesture and not some sort of attempt to extort money from me.

Never been to one that provides a lunchbox type thing. Been to more in homes or halls. Usually adults have leftovers as often enough for that and I've always given tea/coffee/water for adults and cake. Maybe check with softplay because they might have rules.

Party booked now, time 11 - 1, so over lunch. We'll make sure that adults have some picky bits but if they want something more substantial they can order from the cafe. We'll also have an open tab for tea/coffee.

Thanks MN for your words of wisdom!