Recruit other team members. A good minimum goal is getting 7-8 or more walkers to register, fundraise, and participate with you. (There's no minimum size, but what kind of team has only one person on it?)
Raise money yourself, and make it clear to your team members that you expect them to raise money too.
Rally your team throughout the campaign to keep recruiting and fundraising, and keep them together and organized - especially on event day.
Don't take yourself too seriously
Be their biggest cheer leader
Follow up after the event - thank them for their effort and remind them to collect all the pledges you raised.
Consider asking your...
Spouse/partner: Of course they'll join your team. Tell them it's a date... then surprise them with the news they're about to spend it with hundreds of other sweaty people wearing toques - they'll never forget the moment you asked.
Kids: Hey, why not? What a learning opportunity! The issues of the hungry, homeless, and hurting are so important - what a great way for them to learn.
Siblings: You've got a couple on your "nice list" right? Great - now put them on your recruitment list.
Mom or Dad: Before you were born, they used to have a life. They did stuff, they had fun, they know more than you think - so ask them!
Workpeople: Yeah, that's a term. All week long they keep thinking how wonderful you are - you might as well invite them on your team and prove their assumptions correct!
Neighbours: You shoveled their driveway all last winter, so they kind of owe you now - cash in and invite them.
Friends: They'd love to join you because you're the most bestest bestie for life friend in the whole wide world, with a cherry and five hashtags on top.
Boss: She'd be soooo impressed. Nut then even more impressed when she finds out you didn't invite her to impress her...
Pastor/Minister/Old-timey vicar: Tell them they can wear their vestments on the walk, if they want.
Classmates: Save them from a Saturday of Netflix binging - give them a chance to join you and do something fun and meaningful.
Church/study/small group: These folks are great fun and might love to walk for a few hours on a Saturday. If they're not convinced, tell them there's a potluck - church people LOVE potlucks.
Pilates instructor, yoga friend, the guy beside you on the bus every morning, your favourite barista who always remembers your order, your accountant, your lawyer (our causes are a matter of justice - they should be all over it), your doctor, dentist, or do-gooder friend at the club - the list is endless. Enjoy the brainstorming.