Emmylou, here I am with yet more free advice for you (formerly 1001 Others, now reincarnated!)
The reason why last night was a flop is because a lot - if not most - people don't have a spare $100 to spend on secondhand stuff at the moment. Life is expensive, and that $100 would go a long way towards household costs.
Run another event - this time, via silent auction. Create a new Instagram page and take the time to list each and every item on a separate post, with a reference for interested parties to quote, when they DM you with their best and final offer. Make the auction run for a good couple of weeks, and promote it via your main page. You might not get as much as you hope for some items, but you'll still be shifting them along and getting some $ in.
OR ...
Section off one part of your warehouse and make it a recycled boutique. Check your insurance and lease agreement to ensure you're allowed to use the warehouse in this capacity. Stuff will take longer to sell but if you're intent on getting the highest price possible for the items then this might be the best way to go. Just make sure someone is on site at the warehouse when you say they will be, to greet prospective buyers.