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I just got a 10 liter bucket of Heinz BBQ sauce for free, and the expiration date is next week. Any ideas how to properly utilize it?

'Expiration' dates on anything that's not baby formula aren't. They're 'best used by' or 'sell by', but many restaurants will get rid of it for liability issues.

Although it should be good for many months past that date, it'd be better stored refrigerated, and I suspect most people don't have the fridge space for that sort of thing.

What I'd recommend is finding a soup kitchen or similar near you and donating it. They could slow cook chicken or pork in it for a very easy meal, or even glaze and grill it. If any of the churches near you do big dinners as fund raisers, that's another possibility.

That's going to be a "best before" date, not a "use by" date (if it's the same ketchup-like stuff you get in the supermarket). So assuming it's sealed at the moment, open it when you want to use some, and then get through it within the "after opening" instructions (probably something like "keep in the fridge, use within 4 weeks"). You may need to decant into smaller containers to fit in a domestic fridge; you could also freeze some at that stage.