The ACBL website has an up-to-date and searchable webpage which you can find all the upcoming events.
Once on the ACBL tournaments webpage, you will then have many dropdown menus to choose from where you can filter events by month, year, district, etc…
To get you started:
Click the link http://www.acbl.org/tournaments/display.php
In the “District” dropdown, Select “1”, for category, select ‘Regional’ and for months, select ‘All Months’
Here is a recap of District Regionals