This can be done easily by using the CAML filters.
EXEdit -> Display -> CAML FIlter -> Edit
Add a new condition and under the edit options you can select which field in the list will be the index based off of the query string.
Under "Value Source" select HttpParameter and under source name type in what the query string variable is refered to (e.g. foo.com?q=bar then the variable would be q).
edit: I just saw that your post reference Calendar View. What I wrote works for list view, it should be applicable to the calendar as well.