We came across your contribution entitled <name of your paper here> published in <journal name here> and thought your expertise would be an excellent fit for <name of this unrelated – to your specialty – congress>.
We invite you as speaker at <full name of congress with dates>.
It is becoming a new form of either spamming or phishing (I still haven’t decided yet) or actually maybe a combination of both, especially that most seem to come from meeting organizers on topics that are completely unrelated to my field of expertise for the said meeting. I now received 7-10 of such invitations per week.
Ruminating... 