Python pandas - how to merge indices?

Question

Python

Question 1:
I extracted a table from PDF and brought it to this form using pandas:



The "date" column is built from two other columns (respectively: "day of the week", "number"), but it is necessary to convert them to such a form, for example: ("Monday 04.Sep") the index needs a single row, is it possible to somehow implement this at this stage, or was it worth initially combining two columns?

Question 2:
The same "date" column is now represented by an index only on the first row of a certain date, is it possible to somehow "stretch" this same date to the end of each block?