It would be better to wrap the whole block template in a div like this:

<div class="piCal_comingschedule">
.
.
.
</div>

and then in your theme's style.css put:

.piCal_comingschedule dl {
margin: 0px;
}

This gives you maximum flexibility. Just adding these classes to the templates once would let everyone have their own styles without ever touching the templates again.