Timing of Group Thank You Gift

My grandmother is throwing us a couple's shower and as a thank you gift my fiance and I are planning to take her to a show (ballet, musical, concert, etc. - we haven't settled on what show yet). We also want to include my mom and my future mother-in-law as they are doing other things to help us out, including hosting the rehearsal dinner.


I am wondering about the timing of presenting the 3 women with this group gift since the shower is a couple of months before the rehearsal dinner. We were originally planning to do it at the rehearsal dinner but I am wondering if this will leave my grandmother thinking that we aren't acknowledging her for the shower. We would of course send a thank you card right after the shower, but now I am wondering if we should we consider a small hostess gift and thank you card at the shower itself? Any thoughts or suggestions about the timing would be appreciated!