I have different cards that I associate with the spokes of the Wheel of the Year, and for me, Samhain/Halloween is very much about the High Priestess. Come Halloween, I'll be doing a massive reading for myself using the High Priestess as a significator.
Depending on your tastes, you could select a card (or cards) that resonate with what Halloween means to you, and do a ritual involving them. You wouldn't necessarily need candles, but you could construct a crystal grid, brew an herbal tea, read out a relevant poem/prayer, etc. It depends on what you believe and what you practice, but those are a few basic ideas. If you're a dualist Wiccan, you might want to choose two cards to represent the respective energies of the Goddess and dying God at this point in the year, and place them on your altar.
You could also do some kind of pathworking/active imagination/astral projection, and actually try to interact one-on-one with the energy of the card.
These are just a few ideas, but hopefully they'll spark some inspiration for you.
That actually makes me want to do a prayer now, but I'll have to figure out who to pray to, I might use the Major Arcana so that I can use it as a model for each God/Goddess I pray to