The Query interface available in the Posts element and the Query Loop feature of Bricks enables us to order items of any post type by the value of a date-type of custom field.
Here’s a sample screenshot of this out-of-the-box option:

Here we are telling Bricks to ask WordPress to fetch the latest 10 (this is the number set at Settings → Reading → Blog pages show at most) posts of a workshop Custom Post Type with the items (posts) ordered in ascending order of the value of a workshop_date custom field that is of Date-type.
Note that this will output only the posts that have the custom field populated.
3 comments
Joseph Orr
Hm, when I set the Order meta key it seems as though the items disappear completely. Are you sure this works with the ACF Date Picker field type?
Sridhar Katakam
Just tested and works fine here.
Field group: https://d.pr/i/iDV6Nx
Query loop: https://d.pr/i/BYRMff
Sample data: https://d.pr/i/Xd537R
Before output: https://d.pr/i/PQo18w
After output: https://d.pr/i/S0HwFd
Bricks 1.12.1
Joseph Orr
You are right! I got it working now. The issue was this: I had the Start Date and End Date in a ACF Group, so I had to also include the group Taxonomy term as well.
So instead of "start_date" for the Meta value, I had to use "show_dates_start_date" for the Meta value. I wasn't aware that I needed the parent group term as well.