Hi, Marsha.
Thanks for your thorough question.
I visited that page and the autocomplete works both as a checkbox/dropdown and also as a typeahead field. Here’s a GIF of the dropdown way your event creators can use the field: https://cl.ly/2T43383V0Y1G
Some site owners don’t realize it works this way. Are you still wanting to override it to instead be a dropdown field instead of a select field?
If you do, Community Events v4.5 is when this changed. Using v4.4.7’s /wp-content/plugins/the-events-calendar-community-events/src/views/community/modules/taxonomy.php instead would not work with the rest of v4.5’s codebase, but it could be customized to possibly do so.
If you need some coding help, you may want to ask your developer or reference our documentation and list of known customizers.
Please let me know if you have any follow-up questions on this topic.