I am making some updates for a client. I've used Post Grid in the past, and loved it, so I wanted to use it again on this project. In this case, the client has a club and regularly has events. Without forcing him to go in and delete events that have passed, I was hoping to simply use the date parameter. Unfortunately, it looks like the date range is extremely specific. Is there any easy way to just exclude dates that are basically older than "today"?
Welcome to our forum.
there is some limitation to display advanced options for query post parameter, although you can filter query arguments.
Please see the documentation here
https://pickplugins.com/documentation/post-grid/filter-hooks/post_grid_query_args/
you can add your own query arguments via this filter hook. in pro version, there is post grid id parameter so you can apply query arguments by post grid id. i hope you understand.
Regards
Please do not forget to check WP_Query class arguments references
https://codex.wordpress.org/Class_Reference/WP_Query
Regards