Chocolate Parties

We've been making random stabs in the dark on this and I don't know why I hadn't thought to ask my peers here.

Hosting parties in your shop--

How have youderiveda pricing for this? I know how much everything costs, COG+LO down to the minute & the product costs, but I don't know a good multiple or value proposition.

We're being asked consistently for hosting parties and while we come up with some form of cost that makes us feel like we're not selling ourselves short it doesn't feel very bound to a principle that is solid.

If you're holding a chocolate bark making party/class, and everyone walks out with 4+oz of product & inclusions $11-15 a head seems reasonable (min. 6 people), but are we leaving money on the table?

If you have a corporate gathering that brings in wine and you supply pairings to them and host them, whats a good rule of thumb for that? We basically aren't doing much at that point so its more a space rental with some product and the companies don't seem to care how much they pay so it's hard to get a good feel.

I can calculate a lot of multiples or clearing, or time invested, but it feels like space rental and parties have a different logic to them that has something to do with what a market can bear along with the quality perceived. Just a bit harder and nebulous for me to wrap my head around. Thought maybe someone here has done some harder (or made it simpler) thinking than myself and would love to inference it.