DC Yoshinkan Aikido trains in the Northern Virginia Ki Aikido Dojo on Saturdays for a 2 hour period from 1pm - 3pm. You can find their main page here: https://novakiaikido.org/index.php
The Dojo is located in the Mosaic district in Fairfax.
It is a large traditional Aikido Dojo with tatami mats. There is plenty of room for everyone to train.