Hey Kathryn!
We indeed have a “Non-Profit Partnership Program” which means free licenses for approved non-profits. You can learn more here → https://theeventscalendar.com/knowledgebase/do-you-offer-discounts-for-non-profit-organizations/
And you can apply directly here → https://theeventscalendar.com/apply-for-nppp/
If approved, we can give you a free license for Eventbrite Tickets, which is our Eventbrite plugin (learn more about it here).
That’s an add-on for The Events Calendar itself, but The Events Calendar is free for everyone and available for download here → https://wordpress.org/plugins/the-events-calendar/
There’s lots of links here, but I hope this all helps!
Cheers,
George
PS
Hello from Allston/Brighton 🙂 Sudbury Senior Center should have no problem getting approved for a non-profit license!