Greek salad chopped small with optional vegan feta/real feta (the Violife one isn't too bad, considering) - cucumber, olives, cherry tomatoes, more olives, celery, olive oil, marjoram/greek oregano, grilled mini peppers, lemon juice and some sesame or olive bread cut into small pieces? It's similar to bruschetta but might be more in keeping with the main course.
Or perhaps make a pate/spread of broad beans, shallot, olive oil, lemon and thyme to go on bread with sliced tomatoes?
Could also have some Dolmades, bake mini pasties with feta, spinach and vegan soft cheese, melon and cured meats, chargrilled artichokes, more olives, pickled chilli garlic...this is making me hungry.