The heading tag sounds strange as it should only load fields that match the filters to the dataset.
I think you may be complicating it by having separating all of the lineups and the venues. It might be simpler to have less datasets then let have the pages pull up the information based on the filtered page or you can just have all the information listed.
If the video above doesn’t fully answer it, I would suggest reaching out to support as any content manager expert can help by seeing the site, dataset and speak/chat with you in real-time to help you get this sorted.
https://support.wix.com/en/article/contacting-wix-customer-care-for-support