Some free street parking is available.  There is information about Evanston parking here.    A map of parking lots is here.  Note that parking is free on Sunday and there are 4 lots near the church.

The following is from the City of Evanston website in a posting from November 15, 2017:

To encourage community members and visitors to shop and dine in Evanston this holiday season, the City will offer free evening and weekend parking in downtown self-park garages and select business district parking lots starting Thursday, November 23, 2017 through Monday, January 1, 2018.

Free holiday parking will be provided in the Sherman Plaza, Maple Avenue and Church Street parking garages on weekdays, between 5 p.m. and midnight, and all day on Saturdays.   Please note that it is always free to park in Evanston garages and lots on Sundays.