Is it possible to use the verb particle 过 for future events?
In short, yes, only for events in the near future.


  等我喫過(了)，咱們再走。 (= 喫了再走)
  等我玩過(了)，咱們再走。 (= 玩了再走) It's better to use "玩夠了" in this case.
  等我弄過(了)，咱們再走。 (= 弄了再走)


You must say "等 sb" to make it natural.

Note: this is less used than only a "了".