Hi Threadkilla.
MFC have been advertising special open training on Saturday at Casey - but that might not suit your visitors timetable if they’re leaving on Friday.
They do train on non-advertised times at Gosches Paddock, and anyone passing can hang out and watch (but going there is a bit of a lottery as you can imagine, though if you’re going to take a punt, mornings are the go). Your very best bet would be to email or phone the club and let them know your conundrum. My nephew from tassie is a Roos fan (the idiot) but I emailed the Norf people when he came down for a visit and they were really good about providing times when he could go to Arden Street and watch the players. I hope MFC do the same.