Halloween Party Food

I am having a Halloween party which will be 7 or 8 couples with kids my DD's age (16-20 months). It is from 3pm to 7pm on the Saturday before Halloween. I am worndering, should there be enough food to fill people up like a dinner since it goes over dinner time?

We are all fairly granola parents whose kids eat healthy foods only so I plan to have everything homemade and mostly organic which means lots of time and money too... Last year we did a family Christmas party from 4 to 9 and we ended up having WAY too much food and eating leftovers for 3 days. (It was a bigger party, around 13 families) I don't want to spend a whole week preparing food that won't get eaten but I don't want people to be hungry either... How many dishes do you think I need for 18 adults and 9 toddlers?

i'd do pizzas or sandwiches, maybe make spaghetti?

If you don't want to do it all yourself ask everyone to bring something?

I would do a crockpot recipe since you want it to be homemade.

That way you wont have to worry about preparing it and cooking while you get last minute things ready and since it will be pretty cold out, it will be good to warm up the guests.

It isn't a sit down dinner, we do more of a play party with a buffet table set up on the side. I have set the bar pretty high in past years. I made 5 different shrimp canapes for our last party...

This is my menu so far...
-baked savoury apples filled with wild rice and sausage stuffing. (I have the local organic apples already and am very excited about making these!)
-broccoli and smoked cheddar mini quiches (quiche is something I always do so maybe it's getting old though...)
-baked brie with a walnut crust served with homemade crackers (I have the crackers ready if we don't eat them before then)
-veggie platter and assorted crackers with 3 dips: hummous, cilantro-lime yogurt dip and an apple chutney.
-mini meatballs (organic lamb with fresh mint and onion)
-fruit platter
- smoked salmon (my dad caught and smoked it) on rye bread with cream cheese. (Is not seasonallyl appropriate?)