Help a nonprofit, please! multiplying data validation text info (type) by corresponding value on row

I work for a nonprofit and I'm trying to create a report for outreach. I need to know the type of outreach done and topics covered at the event,then tally up attendance per outreach type and by topic covered.
I divided it by week, and where I'm stuck is trying to figure out the grand totals for the whole workbook.

any help would be highly appreciate.

thanks,

AttachmentSize
Organizing Report.xlsx23.35 KB