Do ascetic practices create samvega? If so, how? Do ascetic practices create saṃvega? If so, how?  

(I am trying to find ways to create samvega - and I understand ascetic practices can help in that).
Anyone can arise into samvega, spontaneously. In the West, it is discouraged as a non normative realization which leads to cognitive dissonance. But at any moment, ascetic practice or not, one can stumble into samvega, given fortunate causes and conditions.

In its most simple form, samvega is the thing which causes us to start practicing. To try to find a way out.

This talk may be of help: Samvega and the Flailing Fish 


  Ajahn Thanissaro defines samvega as “the oppressive sense of shock, dismay, and alienation that come with realizing the futility and meaninglessness of life as it's normally lived...and an anxious sense of urgency in trying to find a way out of the meaningless cycle.”