[Zope] dtml-calendar question

Hi Zope Ppl, I hope this is the right list to ask this dtml-calendar question.. here goes anyway: I am using calendar 1.0.16 integrated with sql. It works like a champ thanks to some slight modification of Ed Colmar's nice "StarRave" product. It's getting pretty tricky now though b/c would like to have a link to submit a form of, display results from, and submit a different form for all Sundays, and a different one for all Saturdays. I don't see where in the README or anywhere that allows me to select records based on day of week. Does anyone know how i should go about this? Thanks, Chris