Hey @Mark!
The padding I think you’re referring to unfortunately comes from your theme; I say “unfortunately” because we do not offer support for theme design tweaks, or for the writing of any custom code…
With that being said, however, I took a quick look at your site and would recommend adding the following CSS to the bottom of your theme’s style.css file:
body.post-type-archive-tribe_events div.l-main {
padding-top: 0 !important;
}
Here’s how that made things look on your site for me when I tested this code:

I hope that top-padding is the padding you are referring to, and that this code helps; let me know! 🙂
— George