I'm not vegi or vegan but have friends who are so I do cook vegan / vegi.
Some things I have done. Apologies if you already have a loads of recipes. And vegi / vegan people feel free to critique.
Filo parcels containing brie and a teaspoon of mango chutney.
Filo parcels with cream cheese and mushroom - cook the mushrooms before filling the parcels.
Soup - I'd do a vegan soup that anyone can have, Courgette and coriander has gone down well and if you make it in summer you can serve it chilled.
I make small quantities so work on about 1 courgette per person and I buy big bunches of coriander from an Indian shop. I then wrap in newspaper and put in the freezer.
Slice the courgettes and 'sweat' in a little oil for 10 mins, once the courgette is coloured add boiling water, a veg stock cube and crumble in the coriander. Cook for about 10 more mins. Serve in cups / mugs.
If you have a rice cooker that can keep rice warm then basmati rice, cashew nuts, a glass of orange juice and top up with water. Add seasonings of choice.
Adzuki bean burgers / balls.
One tin of adzuki beans (obviously more for a buffet) drain the beans and put half in a bowl - with the other half mash or blitz in a blender then put it in with the other half of the beans, season and roll in to balls or make into patties, they can be fried or oven baked.
Leave as they are or add a sauce, if you do small balls they can go in a pita bread with salad.