sending

lähetys- (present participle of)
{{quote-magazine|date=2013-07-19|author=http://www.theguardian.com/profile/marktran Mark Tran
The act by which somebody or something is sent.
2008, Klyne Snodgrass, Stories with Intent

Both Matthew and Luke have three sendings of servants, but the narratives are framed differently. Matthew has two sendings of servants (plural) to the original guests, two excuses offered for the refusal, and one sending of servants to the substitute guests.