Molli, as far as I can ascertain, buses are operating on the Frankston line on the weekends. I just looked up the latest and mention is made of 27-28 August for buses from Mordialloc to Caulfield with that adding 45 minutes to any trip each way.
Last weekend, I was cycling past Moorabbin station and buses were operating for the weekend, so I think this could be something to look out for.
That said, before coming online this evening, we had decided to visit the exhibition on Sunday immediately after having lunch, with coffee or whatever after, then returning home. If you like, we could pick you up at Mordialloc, (I'm picking up someone else as well) head in to the exhibition, have some fun, have more fun giving Shane a hard time, have some light nosh somewhere, then head home via the bay dropping you off at Mordialloc.
Thoughts?
Email me if you wish.
Mick.