Question:
Any prohibitions to visit cemetery on Purim or very next day ?
Answer:
The custom is not to go to the cemetery on Purim, or on other days that we don’t say tachanun and don’t eulogize. If it is prohibited, that I don’t know. If someone has yahrtziet on Purim they should go erev Purim.
Sources:
Gesher Hachayim 29-5,