Legal marriage is not available anywhere in the world for same-sex couples at this time.
Ceremonial marriage is possible almost everywhere.
Same-sex ceremonies are not illegal. If you are looking for a religion-based ceremony, and attend a church or temple, ask where you worship about their policies. If they do not offer ceremonies for same-sex couples, ask for affiliates in other locations that do. If you do not attend a church or temple, please ask yourself why you want a ceremony these institutions offer. Weddings can provide a social setting and support for your relationship.