Those doing something Wikimedia-related on NVD can extend an invite to the larger community via the mailing list and Whatsapp group.
Other than that please let's have a look at the NVD Wikipedia article https://en.wikipedia.org/wiki/National_Volunteer_Day and help out. Marian Adeaba has offered to update it, so you can join her by visiting the page. It's a big day for Ghana, get involved in any way you can!
Regards, -- Sandister Tei Video Journalist | Head of Social Media – Citi FM | Rep – Wikipedian Community (Gh)
*Letters to Marissa https://medium.com/letters-to-marissa | Wikipedian Community (Gh) http://www.wmgh.org/ | Purple People https://www.facebook.com/thatpurplelife/*