Problem:
The user has some post with a start and end datetime, on the same day, and he would like to filter the view by dates.
Solution:
The filter shortcode can take a values and dispaly_values arguments. Then we'll need custom code hook into the view and change its query filter.
Problem:
The user would like to have the parent post selected automatically in a form.
Solution:
Regarding the first question, you will need to put the form inside a content template that is bound to the parent post. For example, create a view that will query the "Member" posts where the current user is the author, it should return one post if the user has already a post. Inside the loop, which is bound to that post, you can put the form and use the technique in the following article or the following similar tickets:
- https://toolset.com/course-lesson/selecting-parent-posts-when-using-forms-to-create-child-items/#creating-forms-when-a-parent-post-is-preselected
