Hi Andrew.
In our forums we keep our threads focused on just one issue at a time to ensure we fully answer each of your questions/issues. Please keep this in mind for the future and start a new thread for your additional questions from this thread. Thanks for your understanding, and I’ll answer only your first question.
Regarding #1, I believe you’re asking about this file: /wp-content/plugins/the-events-calendar-community-events/src/views/community/event-list.php
Please see https://theeventscalendar.com/knowledgebase/themers-guide/#community for one way to customize the Community Events Event List view.
Please note that it also has action hooks. Therefore, without using the Themer’s Guide, you could inject content via the tribe_ce_before_event_list_top_buttons action hook.
Please let me know if you have follow-up questions on this item.