Hi Adam,
Yes, you should start another conversation in the meantime even though you have already set up a date with the person.
A mistake a lot of guys make when online dating is in thinking their job is done by simply setting up a date and that no more conversations needs to be had until they meet each other on said date.
That can actually make you lose any momentum or rapport you had already built with her prior to asking her out on a date.
Keep the conversation going between you in the meantime. You don’t have to message every single day, but still maintain a degree of consistency in communication through the week. This helps to make her feel all the more excited about meeting you, which increases the chances that she doesn’t cancel on you.