Oh that sounds so familiar lol. Sorry I have to laugh cos it seems like the "standard" thing that happens when someone is involved in a scheme like this. A very good friend of DH and I used to pressure me all the time as in calling when DH was at work and often drop brochures off in the letter box and then call the next day to see if I'd read them and then last year he called DH and asked him to attend a presentation at their home. DH told him to back off otherwise they'd lose our friendship and is that what they really wanted He seems to have gotten the message.

If I were you I'd just tell them straight out you're not interested in the presentation but would love to catch up for a drink or go out for dinner somewhere. Good luck