Get participants for my contest

Hi! I run a free tipping contest in my blog. I need participants for the contest, must be from Northern Europe. I need approx 100 who will take part in the competition for a period of 2 months, 1 time each week. They must also subscribe to my blog for this period. I addition they must sign up to my sponsors websites (betting related, no cost). No bots please, no spamming, these must be real deal live individuals. Please let me know how you will get hold of the 100 participants! Participants will win prizes if they do good.