Can anyone who attend an annual pithru/bhathru ceremony function and after having food in ceremony can directly go or visit some other closer relative's house?
What Dharma Shastra say about this?
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Manu Smriti 3.249. The foolish man who, after having eaten a Sraddha (-dinner), gives the leavings to a Sudra, falls headlong into the Kalasutra hell.
Manu Smriti 3.250. If the partaker of a Sraddha (-dinner) enters on the same day the bed of a Sudra female, the manes of his (ancestors) will lie during that month in her ordure
AFAIK, these are the only two restrictions for a person who took a Shraddha meal. No such restrictions, like what you have mentioned, are there .