It is permissible to visit the places that have been established to simulate the shrines of the Ahlulbait (peace be upon them) in order to revive their remembrances and have gatherings to mourn them, and similar activities that are conducted to remind others about them.
Taking photographs is a permissible profession. You can also take photographs in mixed gathering such as weddings where women are not observing Hijab, but it is prohibited to look at non-Mahram women with lust. Having said that, women must wear the Hijab in the presence of non-Mahram men even in wedding ceremonies. Observing Hijab is obligatory on the woman in any place in the presence of non-Mahram men, even at her own house. It is better to hire a woman to do the photography in such cases.