Information Release Timing by Topic

Does anyone know of a resource that would list the popularity of topics/activities by day of the week?

I'm looking for something that might offer some insight into which day of the week might be the best day to release new information on a topic. Obviously, it could be released on any day and people will find it when they find it, but if you want people to come to your site on a regular basis, it be nice to have a posting schedule that would correspond to popularity.

For example, if people tend to have picnics on Saturdays, they might look for picnic information on Fridays. So, it might be useful to release new picnic information every Friday.

To explain further, let's say I have a site on cooking. On the day they visit the site, I want to freshest information to be of the most relevance to them. So, if I released a picnic article on Thursday, when they visit the site on Friday, some other topic is going to be on top. I want the top item to be that which is most relevant to what they might be looking for on that day. So, in this case, I would want to have the new picnic article on Friday rather than Thursday.