[{'date': '110217', 'name': 'ivan'}, {'date': '170518', 'name': 'ivan'}, {'date': '200118', 'name': 'maxim'}, {'date': '110217', 'name': ‘maxim'}]

types = [ {'type':'tango', 'date':'200118'},
{'type':'box', 'date':'110217'},
{'type':'strip', 'date':'170518'}]

user_list = [{'name':'maxim', 'date':'200118'},
{'name':'ivan', 'date':'110217'},
{'name':'elena', 'date':'051018'},
{'name':'gleb', 'date':'170518'},
{'name':'magas', 'date':'110217'},
{'name':'ivan', 'date':'170518'},
{'name':'maxim', 'date':'110217'}]

dates = [dct['date'] for dct in types]
names = list(set([dct['name'] for dct in user_list]))


goodusers = []
for name in names:
    res = []
    for u in user_list:
        if u['name']==name and u['date'] in dates:
            res.append(u)
    if len(res)>1:
        goodusers += res

print(goodusers)

from itertools import groupby

dates = [dct['date'] for dct in types]
# фильтруем по совпадению дат
users = (d for d in user_list if d['date'] in dates)
# сортируем, для работы функции группировки
users = sorted(users, key=lambda u: u['name'])

double_users = []
for _, u in groupby(users, key=lambda u: u['name']):
    pool = tuple(u)
    if len(pool) > 1:
        double_users += pool
print(double_users)