In your reference, you can see that the word "weekdays" can be used either as a Noun (which you normally know) or as an Adverb:
The centre is open on weekdays. (Noun)
The centre is open weekdays. (Adverb)
In the second example, the adverb is describing the verb. So it doesn't need a preposition anymore to connect to the rest of the sentence.
In addition, we sometimes drop "on" before days in spoken English.
For example:
I work out Monday mornings.
See you Friday!
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