Why not take a little time to walk through your neighborhood and drop off a few invitation postcards? You can knock on doors and if nobody answers leave them in the door (not the mailbox) or, if you're too nervous to talk to strangers, you can just leave them. If you get the chance to talk to a few people be sure to ask them if they have any prayer requests. People don't like to give out personal information so if they have prayers for people only ask for first names. Don't forget to bring something to write them down!