Hey David,
Thanks for reaching out! I will address your questions in reverse order:
2. Is it possible to display a list of Attending with full name in event page?
☝️ This is unfortunately only possible with some advanced custom-coding and custom designing on your site. We’re not able to help with custom coding, so you would have to add the custom coding yourself or hire someone to build it out. Sorry to disappoint!
1. I can not change and save Events URL slug and Single event URL slug. why?
☝️ I cannot recreate this issue on my own site, so there could be a code conflict with your theme or another plugin on your site.
To help investigate if this is the case, can you post your site’s complete System Information as described here? ? https://theeventscalendar.com/knowledgebase/sharing-sys-info/
Thanks!
George